TTY: switch tty_flip_buffer_push

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

Now, the one where most of tty_port_tty_get gets removed:
tty_flip_buffer_push.

IOW we also closed all the races in drivers not using tty_port_tty_get
at all yet.

Also we move tty_flip_buffer_push declaration from include/linux/tty.h
to include/linux/tty_flip.h to all others while we are changing it
anyway.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

85 files changed, 224 insertions, 468 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 2d1357a..4c7d701 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -251,7 +251,6 @@ static void receive_chars(struct serial_state *info)
 {
         int status;
 	int serdatr;
-	struct tty_struct *tty = info->tport.tty;
 	unsigned char ch, flag;
 	struct	async_icount *icount;
 	int oe = 0;
@@ -314,7 +313,7 @@ static void receive_chars(struct serial_state *info)
 #endif
 	    flag = TTY_BREAK;
 	    if (info->tport.flags & ASYNC_SAK)
-	      do_SAK(tty);
+	      do_SAK(info->tport.tty);
 	  } else if (status & UART_LSR_PE)
 	    flag = TTY_PARITY;
 	  else if (status & UART_LSR_FE)
@@ -331,7 +330,7 @@ static void receive_chars(struct serial_state *info)
 	tty_insert_flip_char(&info->tport, ch, flag);
 	if (oe == 1)
 		tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&info->tport);
 out:
 	return;
 }
diff --git a/drivers/tty/bfin_jtag_comm.c b/drivers/tty/bfin_jtag_comm.c
index 143c385..a93a424 100644
--- a/drivers/tty/bfin_jtag_comm.c
+++ b/drivers/tty/bfin_jtag_comm.c
@@ -95,18 +95,16 @@ bfin_jc_emudat_manager(void *arg)
 
 		/* if incoming data is ready, eat it */
 		if (bfin_read_DBGSTAT() & EMUDIF) {
-			if (tty != NULL) {
-				uint32_t emudat = bfin_read_emudat();
-				if (inbound_len == 0) {
-					pr_debug("incoming length: 0x%08x\n", emudat);
-					inbound_len = emudat;
-				} else {
-					size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
-					pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
-					inbound_len -= num_chars;
-					tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
-					tty_flip_buffer_push(tty);
-				}
+			uint32_t emudat = bfin_read_emudat();
+			if (inbound_len == 0) {
+				pr_debug("incoming length: 0x%08x\n", emudat);
+				inbound_len = emudat;
+			} else {
+				size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
+				pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
+				inbound_len -= num_chars;
+				tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
+				tty_flip_buffer_push(&port);
 			}
 		}
 
diff --git a/drivers/tty/ehv_bytechan.c b/drivers/tty/ehv_bytechan.c
index 5164f9a..ed92622 100644
--- a/drivers/tty/ehv_bytechan.c
+++ b/drivers/tty/ehv_bytechan.c
@@ -371,16 +371,11 @@ console_initcall(ehv_bc_console_init);
 static irqreturn_t ehv_bc_tty_rx_isr(int irq, void *data)
 {
 	struct ehv_bc_data *bc = data;
-	struct tty_struct *ttys = tty_port_tty_get(&bc->port);
 	unsigned int rx_count, tx_count, len;
 	int count;
 	char buffer[EV_BYTE_CHANNEL_MAX_BYTES];
 	int ret;
 
-	/* ttys could be NULL during a hangup */
-	if (!ttys)
-		return IRQ_HANDLED;
-
 	/* Find out how much data needs to be read, and then ask the TTY layer
 	 * if it can handle that much.  We want to ensure that every byte we
 	 * read from the byte channel will be accepted by the TTY layer.
@@ -422,9 +417,7 @@ static irqreturn_t ehv_bc_tty_rx_isr(int irq, void *data)
 	}
 
 	/* Tell the tty layer that we're done. */
-	tty_flip_buffer_push(ttys);
-
-	tty_kref_put(ttys);
+	tty_flip_buffer_push(&bc->port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 8c2fe3a..eb255e8 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -691,7 +691,7 @@ int hvc_poll(struct hvc_struct *hp)
 		   a minimum for performance. */
 		timeout = MIN_TIMEOUT;
 
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&hp->port);
 	}
 	tty_kref_put(tty);
 
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 7bfc0a9..1956593 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -623,7 +623,7 @@ static int hvcs_io(struct hvcs_struct *hvcsd)
 	spin_unlock_irqrestore(&hvcsd->lock, flags);
 	/* This is synch because tty->low_latency == 1 */
 	if(got)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&hvcsd->port);
 
 	if (!got) {
 		/* Do this _after_ the flip_buffer_push */
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
index 1f528b8..dc59129 100644
--- a/drivers/tty/hvc/hvsi.c
+++ b/drivers/tty/hvc/hvsi.c
@@ -465,7 +465,7 @@ static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct *tty,
 	compact_inbuf(hp, packet);
 
 	if (flip)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&hp->port);
 
 	return 1;
 }
@@ -511,7 +511,7 @@ static irqreturn_t hvsi_interrupt(int irq, void *arg)
 		/* we weren't hung up and we weren't throttled, so we can
 		 * deliver the rest now */
 		hvsi_send_overflow(hp);
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&hp->port);
 	}
 	spin_unlock_irqrestore(&hp->lock, flags);
 
@@ -998,7 +998,7 @@ static void hvsi_unthrottle(struct tty_struct *tty)
 	spin_lock_irqsave(&hp->lock, flags);
 	if (hp->n_throttle) {
 		hvsi_send_overflow(hp);
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&hp->port);
 	}
 	spin_unlock_irqrestore(&hp->lock, flags);
 
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index c43da74..8fd72ff 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -160,15 +160,9 @@ static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
 void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
 			unsigned int length)
 {
-	struct tty_struct *linux_tty;
 	int work = 0;
 
 	mutex_lock(&tty->ipw_tty_mutex);
-	linux_tty = tty->port.tty;
-	if (linux_tty == NULL) {
-		mutex_unlock(&tty->ipw_tty_mutex);
-		return;
-	}
 
 	if (!tty->port.count) {
 		mutex_unlock(&tty->ipw_tty_mutex);
@@ -187,7 +181,7 @@ void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
 	 * This may sleep if ->low_latency is set
 	 */
 	if (work)
-		tty_flip_buffer_push(linux_tty);
+		tty_flip_buffer_push(&tty->port);
 }
 
 static void ipw_write_packet_sent_callback(void *callback_data,
diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
index c70144f..858291c 100644
--- a/drivers/tty/isicom.c
+++ b/drivers/tty/isicom.c
@@ -637,7 +637,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
 			tty_insert_flip_char(&port->port, 0, TTY_BREAK);
 			if (port->port.flags & ASYNC_SAK)
 				do_SAK(tty);
-			tty_flip_buffer_push(tty);
+			tty_flip_buffer_push(&port->port);
 			break;
 
 		case 2:	/* Statistics		 */
@@ -671,7 +671,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
 				byte_count -= 2;
 			}
 		}
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&port->port);
 	}
 	outw(0x0000, base+0x04); /* enable interrupts */
 	spin_unlock(&card->card_lock);
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index e9cdfdf..ad34a20 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2145,7 +2145,7 @@ end_intr:
 	 * recursive locking.
 	 */
 	spin_unlock(&port->slock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->port);
 	spin_lock(&port->slock);
 }
 
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 4a3342d..d84dcfe 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1141,7 +1141,6 @@ static void gsm_control_modem(struct gsm_mux *gsm, u8 *data, int clen)
 static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
 {
 	struct tty_port *port;
-	struct tty_struct *tty;
 	unsigned int addr = 0 ;
 	u8 bits;
 	int len = clen;
@@ -1174,12 +1173,8 @@ static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
 	if (bits & 8)
 		tty_insert_flip_char(port, 0, TTY_FRAME);
 
-	/* See if we have an uplink tty */
-	tty = tty_port_tty_get(port);
-	if (tty) {
-		tty_flip_buffer_push(tty);
-		tty_kref_put(tty);
-	}
+	tty_flip_buffer_push(port);
+
 	gsm_control_reply(gsm, CMD_RLS, data, clen);
 }
 
@@ -1552,36 +1547,37 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, u8 *data, int clen)
 {
 	/* krefs .. */
 	struct tty_port *port = &dlci->port;
-	struct tty_struct *tty = tty_port_tty_get(port);
+	struct tty_struct *tty;
 	unsigned int modem = 0;
 	int len = clen;
 
 	if (debug & 16)
-		pr_debug("%d bytes for tty %p\n", len, tty);
-	if (tty) {
-		switch (dlci->adaption)  {
-		/* Unsupported types */
-		/* Packetised interruptible data */
-		case 4:
-			break;
-		/* Packetised uininterruptible voice/data */
-		case 3:
-			break;
-		/* Asynchronous serial with line state in each frame */
-		case 2:
-			while (gsm_read_ea(&modem, *data++) == 0) {
-				len--;
-				if (len == 0)
-					return;
-			}
+		pr_debug("%d bytes for tty\n", len);
+	switch (dlci->adaption)  {
+	/* Unsupported types */
+	/* Packetised interruptible data */
+	case 4:
+		break;
+	/* Packetised uininterruptible voice/data */
+	case 3:
+		break;
+	/* Asynchronous serial with line state in each frame */
+	case 2:
+		while (gsm_read_ea(&modem, *data++) == 0) {
+			len--;
+			if (len == 0)
+				return;
+		}
+		tty = tty_port_tty_get(port);
+		if (tty) {
 			gsm_process_modem(tty, dlci, modem, clen);
-		/* Line state will go via DLCI 0 controls only */
-		case 1:
-		default:
-			tty_insert_flip_string(port, data, len);
-			tty_flip_buffer_push(tty);
+			tty_kref_put(tty);
 		}
-		tty_kref_put(tty);
+	/* Line state will go via DLCI 0 controls only */
+	case 1:
+	default:
+		tty_insert_flip_string(port, data, len);
+		tty_flip_buffer_push(port);
 	}
 }
 
diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
index 941fe80..afdd773 100644
--- a/drivers/tty/nozomi.c
+++ b/drivers/tty/nozomi.c
@@ -1272,15 +1272,11 @@ static irqreturn_t interrupt_handler(int irq, void *dev_id)
 
 exit_handler:
 	spin_unlock(&dc->spin_mutex);
-	for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
-		struct tty_struct *tty;
-		if (test_and_clear_bit(a, &dc->flip)) {
-			tty = tty_port_tty_get(&dc->port[a].port);
-			if (tty)
-				tty_flip_buffer_push(tty);
-			tty_kref_put(tty);
-		}
-	}
+
+	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
+		if (test_and_clear_bit(a, &dc->flip))
+			tty_flip_buffer_push(&dc->port[a].port);
+
 	return IRQ_HANDLED;
 none:
 	spin_unlock(&dc->spin_mutex);
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 3c285d3..32d027c 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -123,7 +123,7 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
 		c = tty_insert_flip_string(to->port, buf, c);
 		/* And shovel */
 		if (c) {
-			tty_flip_buffer_push(to);
+			tty_flip_buffer_push(to->port);
 			tty_wakeup(tty);
 		}
 	}
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 5848a76..8073cc0 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -315,9 +315,8 @@ static inline int rocket_paranoia_check(struct r_port *info,
  *  that receive data is present on a serial port.  Pulls data from FIFO, moves it into the 
  *  tty layer.  
  */
-static void rp_do_receive(struct r_port *info,
-			  struct tty_struct *tty,
-			  CHANNEL_t * cp, unsigned int ChanStatus)
+static void rp_do_receive(struct r_port *info, CHANNEL_t *cp,
+		unsigned int ChanStatus)
 {
 	unsigned int CharNStat;
 	int ToRecv, wRecv, space;
@@ -416,7 +415,7 @@ static void rp_do_receive(struct r_port *info,
 			cbuf[ToRecv - 1] = sInB(sGetTxRxDataIO(cp));
 	}
 	/*  Push the data up to the tty layer */
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&info->port);
 }
 
 /*
@@ -495,7 +494,6 @@ static void rp_do_transmit(struct r_port *info)
 static void rp_handle_port(struct r_port *info)
 {
 	CHANNEL_t *cp;
-	struct tty_struct *tty;
 	unsigned int IntMask, ChanStatus;
 
 	if (!info)
@@ -506,12 +504,7 @@ static void rp_handle_port(struct r_port *info)
 				"info->flags & NOT_INIT\n");
 		return;
 	}
-	tty = tty_port_tty_get(&info->port);
-	if (!tty) {
-		printk(KERN_WARNING "rp: WARNING: rp_handle_port called with "
-				"tty==NULL\n");
-		return;
-	}
+
 	cp = &info->channel;
 
 	IntMask = sGetChanIntID(cp) & info->intmask;
@@ -520,7 +513,7 @@ static void rp_handle_port(struct r_port *info)
 #endif
 	ChanStatus = sGetChanStatus(cp);
 	if (IntMask & RXF_TRIG) {	/* Rx FIFO trigger level */
-		rp_do_receive(info, tty, cp, ChanStatus);
+		rp_do_receive(info, cp, ChanStatus);
 	}
 	if (IntMask & DELTA_CD) {	/* CD change  */
 #if (defined(ROCKET_DEBUG_OPEN) || defined(ROCKET_DEBUG_INTR) || defined(ROCKET_DEBUG_HANGUP))
@@ -528,10 +521,15 @@ static void rp_handle_port(struct r_port *info)
 		       (ChanStatus & CD_ACT) ? "on" : "off");
 #endif
 		if (!(ChanStatus & CD_ACT) && info->cd_status) {
+			struct tty_struct *tty;
 #ifdef ROCKET_DEBUG_HANGUP
 			printk(KERN_INFO "CD drop, calling hangup.\n");
 #endif
-			tty_hangup(tty);
+			tty = tty_port_tty_get(&info->port);
+			if (tty) {
+				tty_hangup(tty);
+				tty_kref_put(tty);
+			}
 		}
 		info->cd_status = (ChanStatus & CD_ACT) ? 1 : 0;
 		wake_up_interruptible(&info->port.open_wait);
@@ -544,7 +542,6 @@ static void rp_handle_port(struct r_port *info)
 		printk(KERN_INFO "DSR change...\n");
 	}
 #endif
-	tty_kref_put(tty);
 }
 
 /*
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index a44345a..c7e8b60 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -85,7 +85,6 @@ static void serial21285_enable_ms(struct uart_port *port)
 static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned int status, ch, flag, rxs, max_count = 256;
 
 	status = *CSR_UARTFLG;
@@ -115,7 +114,7 @@ static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 
 		status = *CSR_UARTFLG;
 	}
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 5fb6577..0d771ec 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -1323,7 +1323,6 @@ unsigned char
 serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
 {
 	struct uart_port *port = &up->port;
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned char ch;
 	int max_count = 256;
 	char flag;
@@ -1388,7 +1387,7 @@ ignore_char:
 		lsr = serial_in(up, UART_LSR);
 	} while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
 	spin_unlock(&port->lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 	spin_lock(&port->lock);
 	return lsr;
 }
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 872f14a..84b90fd 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -139,7 +139,7 @@ static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
 		uart_insert_char(port, 0, 0, ch, flag);
 	}
 
-	tty_flip_buffer_push(port->state->port.tty);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 684a080..e133c88 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -231,7 +231,7 @@ static void altera_uart_rx_chars(struct altera_uart *pp)
 				 flag);
 	}
 
-	tty_flip_buffer_push(port->state->port.tty);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void altera_uart_tx_chars(struct altera_uart *pp)
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 22317dd..c368405 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -116,7 +116,6 @@ static void pl010_enable_ms(struct uart_port *port)
 
 static void pl010_rx_chars(struct uart_amba_port *uap)
 {
-	struct tty_struct *tty = uap->port.state->port.tty;
 	unsigned int status, ch, flag, rsr, max_count = 256;
 
 	status = readb(uap->port.membase + UART01x_FR);
@@ -165,7 +164,7 @@ static void pl010_rx_chars(struct uart_amba_port *uap)
 		status = readb(uap->port.membase + UART01x_FR);
 	}
 	spin_unlock(&uap->port.lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&uap->port.state->port);
 	spin_lock(&uap->port.lock);
 }
 
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index e1257d1..3ea5408 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -699,7 +699,6 @@ static void pl011_dma_rx_chars(struct uart_amba_port *uap,
 			       bool readfifo)
 {
 	struct tty_port *port = &uap->port.state->port;
-	struct tty_struct *tty = port->tty;
 	struct pl011_sgbuf *sgbuf = use_buf_b ?
 		&uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a;
 	struct device *dev = uap->dmarx.chan->device->dev;
@@ -754,7 +753,7 @@ static void pl011_dma_rx_chars(struct uart_amba_port *uap,
 	dev_vdbg(uap->port.dev,
 		 "Took %d chars from DMA buffer and %d chars from the FIFO\n",
 		 dma_count, fifotaken);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 	spin_lock(&uap->port.lock);
 }
 
@@ -1076,12 +1075,10 @@ static void pl011_enable_ms(struct uart_port *port)
 
 static void pl011_rx_chars(struct uart_amba_port *uap)
 {
-	struct tty_struct *tty = uap->port.state->port.tty;
-
 	pl011_fifo_to_tty(uap);
 
 	spin_unlock(&uap->port.lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&uap->port.state->port);
 	/*
 	 * If we were temporarily out of DMA mode for a while,
 	 * attempt to switch back to DMA mode again.
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index 59ae2b5..6331464 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -78,7 +78,6 @@ static void apbuart_enable_ms(struct uart_port *port)
 
 static void apbuart_rx_chars(struct uart_port *port)
 {
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned int status, ch, rsr, flag;
 	unsigned int max_chars = port->fifosize;
 
@@ -126,7 +125,7 @@ static void apbuart_rx_chars(struct uart_port *port)
 		status = UART_GET_STATUS(port);
 	}
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void apbuart_tx_chars(struct uart_port *port)
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 6ca5dd6..27f20c5 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -298,10 +298,8 @@ static void ar933x_uart_set_termios(struct uart_port *port,
 static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
 {
 	struct tty_port *port = &up->port.state->port;
-	struct tty_struct *tty;
 	int max_count = 256;
 
-	tty = tty_port_tty_get(port);
 	do {
 		unsigned int rdata;
 		unsigned char ch;
@@ -324,10 +322,7 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
 			tty_insert_flip_char(port, ch, TTY_NORMAL);
 	} while (max_count-- > 0);
 
-	if (tty) {
-		tty_flip_buffer_push(tty);
-		tty_kref_put(tty);
-	}
+	tty_flip_buffer_push(port);
 }
 
 static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index b468601..da73422 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -211,12 +211,8 @@ static void arc_serial_start_tx(struct uart_port *port)
 
 static void arc_serial_rx_chars(struct arc_uart_port *uart)
 {
-	struct tty_struct *tty = tty_port_tty_get(&uart->port.state->port);
 	unsigned int status, ch, flg = 0;
 
-	if (!tty)
-		return;
-
 	/*
 	 * UART has 4 deep RX-FIFO. Driver's recongnition of this fact
 	 * is very subtle. Here's how ...
@@ -252,10 +248,8 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart)
 		uart_insert_char(&uart->port, status, RXOERR, ch, flg);
 
 done:
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&uart->port.state->port);
 	}
-
-	tty_kref_put(tty);
 }
 
 /*
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 9295670..d4a7c24 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -774,7 +774,7 @@ static void atmel_rx_from_ring(struct uart_port *port)
 	 * uart_start(), which takes the lock.
 	 */
 	spin_unlock(&port->lock);
-	tty_flip_buffer_push(port->state->port.tty);
+	tty_flip_buffer_push(&port->state->port);
 	spin_lock(&port->lock);
 }
 
@@ -782,7 +782,6 @@ static void atmel_rx_from_dma(struct uart_port *port)
 {
 	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct atmel_dma_buffer *pdc;
 	int rx_idx = atmel_port->pdc_rx_idx;
 	unsigned int head;
@@ -850,7 +849,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
 	 * uart_start(), which takes the lock.
 	 */
 	spin_unlock(&port->lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 	spin_lock(&port->lock);
 
 	UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index de30b19..719594e 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -236,14 +236,12 @@ static const char *bcm_uart_type(struct uart_port *port)
 static void bcm_uart_do_rx(struct uart_port *port)
 {
 	struct tty_port *port = &port->state->port;
-	struct tty_struct *tty;
 	unsigned int max_count;
 
 	/* limit number of char read in interrupt, should not be
 	 * higher than fifo size anyway since we're much faster than
 	 * serial port */
 	max_count = 32;
-	tty = port->tty;
 	do {
 		unsigned int iestat, c, cstat;
 		char flag;
@@ -305,7 +303,7 @@ static void bcm_uart_do_rx(struct uart_port *port)
 
 	} while (--max_count);
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 }
 
 /*
diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
index e4d3ac2..487c173 100644
--- a/drivers/tty/serial/bfin_sport_uart.c
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -150,7 +150,6 @@ static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
 {
 	struct sport_uart_port *up = dev_id;
 	struct tty_port *port = &up->port.state->port;
-	struct tty_struct *tty = tport->tty;
 	unsigned int ch;
 
 	spin_lock(&up->port.lock);
@@ -162,7 +161,8 @@ static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
 		if (!uart_handle_sysrq_char(&up->port, ch))
 			tty_insert_flip_char(port, ch, TTY_NORMAL);
 	}
-	tty_flip_buffer_push(tty);
+	/* XXX this won't deadlock with lowlat? */
+	tty_flip_buffer_push(port);
 
 	spin_unlock(&up->port.lock);
 
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 2e2b2c1..12dceda 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -223,7 +223,6 @@ static void bfin_serial_enable_ms(struct uart_port *port)
 #ifdef CONFIG_SERIAL_BFIN_PIO
 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 {
-	struct tty_struct *tty = NULL;
 	unsigned int status, ch, flg;
 	static struct timeval anomaly_start = { .tv_sec = 0 };
 
@@ -242,11 +241,9 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 			return;
 		}
 
-	if (!uart->port.state || !uart->port.state->port.tty)
+	if (!uart->port.state)
 		return;
 #endif
-	tty = uart->port.state->port.tty;
-
 	if (ANOMALY_05000363) {
 		/* The BF533 (and BF561) family of processors have a nice anomaly
 		 * where they continuously generate characters for a "single" break.
@@ -325,7 +322,7 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 	uart_insert_char(&uart->port, status, OE, ch, flg);
 
  ignore_char:
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&uart->port.state->port);
 }
 
 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
@@ -426,7 +423,6 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 
 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 {
-	struct tty_struct *tty = uart->port.state->port.tty;
 	int i, flg, status;
 
 	status = UART_GET_LSR(uart);
@@ -471,7 +467,7 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 	}
 
  dma_ignore_char:
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&uart->port.state->port);
 }
 
 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 3fd2526..bfb1796 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -85,12 +85,8 @@ static void uart_clps711x_enable_ms(struct uart_port *port)
 static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
-	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
 	unsigned int status, ch, flg;
 
-	if (!tty)
-		return IRQ_HANDLED;
-
 	for (;;) {
 		status = clps_readl(SYSFLG(port));
 		if (status & SYSFLG_URXFE)
@@ -130,9 +126,7 @@ static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
 		uart_insert_char(port, status, UARTDR_OVERR, ch, flg);
 	}
 
-	tty_flip_buffer_push(tty);
-
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&port->state->port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 0bb2437..97f4e18 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -246,7 +246,6 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	unsigned char ch;
 	u8 *cp;
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 	cbd_t __iomem *bdp;
 	u16 status;
@@ -323,7 +322,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
 	pinfo->rx_cur = bdp;
 
 	/* activate BH processing */
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 
 	return;
 
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index 52449ad..45acf10 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -2104,17 +2104,10 @@ static int force_eop_if_needed(struct e100_serial *info)
 
 static void flush_to_flip_buffer(struct e100_serial *info)
 {
-	struct tty_struct *tty;
 	struct etrax_recv_buffer *buffer;
 	unsigned long flags;
 
 	local_irq_save(flags);
-	tty = info->port.tty;
-
-	if (!tty) {
-		local_irq_restore(flags);
-		return;
-	}
 
 	while ((buffer = info->first_recv_buffer) != NULL) {
 		unsigned int count = buffer->length;
@@ -2138,7 +2131,7 @@ static void flush_to_flip_buffer(struct e100_serial *info)
 	local_irq_restore(flags);
 
 	/* This includes a check for low-latency */
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&info->port);
 }
 
 static void check_flush_timeout(struct e100_serial *info)
@@ -2274,12 +2267,6 @@ static
 struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
 {
 	unsigned long data_read;
-	struct tty_struct *tty = info->port.tty;
-
-	if (!tty) {
-		printk("!NO TTY!\n");
-		return info;
-	}
 
 	/* Read data and status at the same time */
 	data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
@@ -2382,7 +2369,7 @@ more_data:
 		goto more_data;
 	}
 
-	tty_flip_buffer_push(info->port.tty);
+	tty_flip_buffer_push(&info->port);
 	return info;
 }
 
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index 6491b86..2f2b2e5 100644
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -187,7 +187,6 @@ static inline void dz_receive_chars(struct dz_mux *mux)
 {
 	struct uart_port *uport;
 	struct dz_port *dport = &mux->dport[0];
-	struct tty_struct *tty = NULL;
 	struct uart_icount *icount;
 	int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
 	unsigned char ch, flag;
@@ -197,7 +196,6 @@ static inline void dz_receive_chars(struct dz_mux *mux)
 	while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
 		dport = &mux->dport[LINE(status)];
 		uport = &dport->port;
-		tty = uport->state->port.tty;	/* point to the proper dev */
 
 		ch = UCHAR(status);		/* grab the char */
 		flag = TTY_NORMAL;
@@ -249,7 +247,7 @@ static inline void dz_receive_chars(struct dz_mux *mux)
 	}
 	for (i = 0; i < DZ_NB_PORT; i++)
 		if (lines_rx[i])
-			tty_flip_buffer_push(mux->dport[i].port.state->port.tty);
+			tty_flip_buffer_push(&mux->dport[i].port.state->port);
 }
 
 /*
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index bdf67b0..de14bd7 100644
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -249,12 +249,9 @@ static irqreturn_t efm32_uart_rxirq(int irq, void *data)
 	int handled = IRQ_NONE;
 	struct uart_port *port = &efm_port->port;
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty;
 
 	spin_lock(&port->lock);
 
-	tty = tty_kref_get(tport->tty);
-
 	if (irqflag & UARTn_IF_RXDATAV) {
 		efm32_uart_write32(efm_port, UARTn_IF_RXDATAV, UARTn_IFC);
 		efm32_uart_rx_chars(efm_port);
@@ -270,10 +267,7 @@ static irqreturn_t efm32_uart_rxirq(int irq, void *data)
 		handled = IRQ_HANDLED;
 	}
 
-	if (tty) {
-		tty_flip_buffer_push(tty);
-		tty_kref_put(tty);
-	}
+	tty_flip_buffer_push(tport);
 
 	spin_unlock(&port->lock);
 
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
index 54903ee..bc9e6b01 100644
--- a/drivers/tty/serial/icom.c
+++ b/drivers/tty/serial/icom.c
@@ -735,7 +735,6 @@ static void recv_interrupt(u16 port_int_reg, struct icom_port *icom_port)
 {
 	short int count, rcv_buff;
 	struct tty_port *port = &icom_port->uart_port.state->port;
-	struct tty_struct *tty = port->tty;
 	unsigned short int status;
 	struct uart_icount *icount;
 	unsigned long offset;
@@ -835,7 +834,7 @@ ignore_char:
 		status = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].flags);
 	}
 	icom_port->next_rcv = rcv_buff;
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 }
 
 static void process_interrupt(u16 port_int_reg,
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
index 4bc6e47..6a6668b 100644
--- a/drivers/tty/serial/ifx6x60.c
+++ b/drivers/tty/serial/ifx6x60.c
@@ -669,12 +669,8 @@ static const struct tty_operations ifx_spi_serial_ops = {
 static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
 				    unsigned char *chars, size_t size)
 {
-	struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
-	if (!tty)
-		return;
 	tty_insert_flip_string(&ifx_dev->tty_port, chars, size);
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&ifx_dev->tty_port);
 }
 
 /**
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index f60c402..be26345 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -518,7 +518,6 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 	unsigned int rx, flg, ignored = 0;
 	struct tty_struct *tty = sport->port.state->port.tty;
 	struct tty_port *port = &sport->port.state->port;
-	struct tty_struct *tty = port->tty;
 	unsigned long flags, temp;
 
 	spin_lock_irqsave(&sport->port.lock, flags);
@@ -576,7 +575,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 
 out:
 	spin_unlock_irqrestore(&sport->port.lock, flags);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/tty/serial/ioc3_serial.c b/drivers/tty/serial/ioc3_serial.c
index edbdc4e..6e4c715 100644
--- a/drivers/tty/serial/ioc3_serial.c
+++ b/drivers/tty/serial/ioc3_serial.c
@@ -1393,7 +1393,6 @@ static inline int do_read(struct uart_port *the_port, char *buf, int len)
  */
 static int receive_chars(struct uart_port *the_port)
 {
-	struct tty_struct *tty;
 	unsigned char ch[MAX_CHARS];
 	int read_count = 0, read_room, flip = 0;
 	struct uart_state *state = the_port->state;
@@ -1403,14 +1402,11 @@ static int receive_chars(struct uart_port *the_port)
 	/* Make sure all the pointers are "good" ones */
 	if (!state)
 		return 0;
-	if (!state->port.tty)
-		return 0;
 
 	if (!(port->ip_flags & INPUT_ENABLE))
 		return 0;
 
 	spin_lock_irqsave(&the_port->lock, pflags);
-	tty = state->port.tty;
 
 	read_count = do_read(the_port, ch, MAX_CHARS);
 	if (read_count > 0) {
@@ -1422,7 +1418,7 @@ static int receive_chars(struct uart_port *the_port)
 	spin_unlock_irqrestore(&the_port->lock, pflags);
 
 	if (flip)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&state->port);
 
 	return read_count;
 }
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index 86f64ed..e2520ab 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -2340,7 +2340,6 @@ static inline int do_read(struct uart_port *the_port, unsigned char *buf,
  */
 static void receive_chars(struct uart_port *the_port)
 {
-	struct tty_struct *tty;
 	unsigned char ch[IOC4_MAX_CHARS];
 	int read_count, request_count = IOC4_MAX_CHARS;
 	struct uart_icount *icount;
@@ -2350,11 +2349,8 @@ static void receive_chars(struct uart_port *the_port)
 	/* Make sure all the pointers are "good" ones */
 	if (!state)
 		return;
-	if (!state->port.tty)
-		return;
 
 	spin_lock_irqsave(&the_port->lock, pflags);
-	tty = state->port.tty;
 
 	request_count = tty_buffer_request_room(&state->port, IOC4_MAX_CHARS);
 
@@ -2369,7 +2365,7 @@ static void receive_chars(struct uart_port *the_port)
 
 	spin_unlock_irqrestore(&the_port->lock, pflags);
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&state->port);
 }
 
 /**
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index c9ce00d..00f250a 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -654,7 +654,7 @@ void jsm_input(struct jsm_channel *ch)
 	spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
 
 	/* Tell the tty layer its okay to "eat" the data now */
-	tty_flip_buffer_push(tp);
+	tty_flip_buffer_push(port);
 
 	jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
 }
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c
index ba2ef62..26a50b0 100644
--- a/drivers/tty/serial/kgdb_nmi.c
+++ b/drivers/tty/serial/kgdb_nmi.c
@@ -202,7 +202,6 @@ bool kgdb_nmi_poll_knock(void)
 static void kgdb_nmi_tty_receiver(unsigned long data)
 {
 	struct kgdb_nmi_tty_priv *priv = (void *)data;
-	struct tty_struct *tty;
 	char ch;
 
 	tasklet_schedule(&priv->tlet);
@@ -210,16 +209,9 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
 	if (likely(!kgdb_nmi_tty_enabled || !kfifo_len(&priv->fifo)))
 		return;
 
-	/* Port is there, but tty might be hung up, check. */
-	tty = tty_port_tty_get(kgdb_nmi_port);
-	if (!tty)
-		return;
-
 	while (kfifo_out(&priv->fifo, &ch, 1))
 		tty_insert_flip_char(&priv->port, ch, TTY_NORMAL);
-	tty_flip_buffer_push(priv->port.tty);
-
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&priv->port);
 }
 
 static int kgdb_nmi_tty_activate(struct tty_port *port, struct tty_struct *tty)
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 1933fe3..15733da 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -163,21 +163,15 @@ static int
 lqasc_rx_chars(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tty_port_tty_get(tport);
 	unsigned int ch = 0, rsr = 0, fifocnt;
 
-	if (!tty) {
-		dev_dbg(port->dev, "%s:tty is busy now", __func__);
-		return -EBUSY;
-	}
-	fifocnt =
-		ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+	fifocnt = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
 	while (fifocnt--) {
 		u8 flag = TTY_NORMAL;
 		ch = ltq_r8(port->membase + LTQ_ASC_RBUF);
 		rsr = (ltq_r32(port->membase + LTQ_ASC_STATE)
 			& ASCSTATE_ANY) | UART_DUMMY_UER_RX;
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 		port->icount.rx++;
 
 		/*
@@ -219,9 +213,10 @@ lqasc_rx_chars(struct uart_port *port)
 			 */
 			tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 	}
+
 	if (ch != 0)
-		tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+		tty_flip_buffer_push(tport);
+
 	return 0;
 }
 
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 5cd1805..c8448e6 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -259,16 +259,6 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
 	unsigned int tmp, flag;
-	struct tty_struct *tty = tty_port_tty_get(tport);
-
-	if (!tty) {
-		/* Discard data: no tty available */
-		while (!(readl(LPC32XX_HSUART_FIFO(port->membase)) &
-			 LPC32XX_HSU_RX_EMPTY))
-			;
-
-		return;
-	}
 
 	/* Read data from FIFO and push into terminal */
 	tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
@@ -289,8 +279,7 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 
 		tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
 	}
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(tport);
 }
 
 static void __serial_lpc32xx_tx(struct uart_port *port)
@@ -367,8 +356,7 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
 	/* Data received? */
 	if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT)) {
 		__serial_lpc32xx_rx(port);
-		if (tty)
-			tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 	}
 
 	/* Transmit data request? */
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index 2e9a390..bb1afa0 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -301,7 +301,6 @@ static void m32r_sio_enable_ms(struct uart_port *port)
 static void receive_chars(struct uart_sio_port *up, int *status)
 {
 	struct tty_port *port = &up->port.state->port;
-	struct tty_struct *tty = tport->tty;
 	unsigned char ch;
 	unsigned char flag;
 	int max_count = 256;
@@ -369,7 +368,7 @@ static void receive_chars(struct uart_sio_port *up, int *status)
 	ignore_char:
 		*status = serial_in(up, UART_LSR);
 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 }
 
 static void transmit_chars(struct uart_sio_port *up)
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index e238e80..791e1df 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -311,8 +311,8 @@ static void max3100_work(struct work_struct *w)
 			}
 		}
 
-		if (rxchars > 16 && s->port.state->port.tty != NULL) {
-			tty_flip_buffer_push(s->port.state->port.tty);
+		if (rxchars > 16) {
+			tty_flip_buffer_push(&s->port.state->port);
 			rxchars = 0;
 		}
 		if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -324,8 +324,8 @@ static void max3100_work(struct work_struct *w)
 		  (!uart_circ_empty(xmit) &&
 		   !uart_tx_stopped(&s->port))));
 
-	if (rxchars > 0 && s->port.state->port.tty != NULL)
-		tty_flip_buffer_push(s->port.state->port.tty);
+	if (rxchars > 0)
+		tty_flip_buffer_push(&s->port.state->port);
 }
 
 static irqreturn_t max3100_irq(int irqno, void *dev_id)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index a801f68..0c2422c 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -460,10 +460,6 @@ static int max310x_set_ref_clk(struct max310x_port *s)
 static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
 {
 	unsigned int sts = 0, ch = 0, flag;
-	struct tty_struct *tty = tty_port_tty_get(&s->port.state->port);
-
-	if (!tty)
-		return;
 
 	if (unlikely(rxlen >= MAX310X_FIFO_SIZE)) {
 		dev_warn(s->port.dev, "Possible RX FIFO overrun %d\n", rxlen);
@@ -516,9 +512,7 @@ static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
 				 ch, flag);
 	}
 
-	tty_flip_buffer_push(tty);
-
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&s->port.state->port);
 }
 
 static void max310x_handle_tx(struct max310x_port *s)
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index fcd56ab..7ed9927 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -310,7 +310,7 @@ static void mcf_rx_chars(struct mcf_uart *pp)
 		uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
 	}
 
-	tty_flip_buffer_push(port->state->port.tty);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 /****************************************************************************/
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index 60d585a..5f4765a 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -388,12 +388,8 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
 	struct hsu_dma_chan *chan = up->rxc;
 	struct uart_port *port = &up->port;
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	int count;
 
-	if (!tty)
-		return;
-
 	/*
 	 * First need to know how many is already transferred,
 	 * then check if its a timeout DMA irq, and return
@@ -438,7 +434,7 @@ void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
 					 | (0x1 << 16)
 					 | (0x1 << 24)	/* timeout bit, see HSU Errata 1 */
 					 );
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 
 	chan_writel(chan, HSU_CH_CR, 0x3);
 
@@ -461,13 +457,9 @@ static void serial_hsu_stop_rx(struct uart_port *port)
 
 static inline void receive_chars(struct uart_hsu_port *up, int *status)
 {
-	struct tty_struct *tty = up->port.state->port.tty;
 	unsigned int ch, flag;
 	unsigned int max_count = 256;
 
-	if (!tty)
-		return;
-
 	do {
 		ch = serial_in(up, UART_RX);
 		flag = TTY_NORMAL;
@@ -523,7 +515,7 @@ static inline void receive_chars(struct uart_hsu_port *up, int *status)
 	ignore_char:
 		*status = serial_in(up, UART_LSR);
 	} while ((*status & UART_LSR_DR) && max_count--);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&up->port.state->port);
 }
 
 static void transmit_chars(struct uart_hsu_port *up)
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 0145aeb..c0e1fad 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -942,7 +942,6 @@ static inline int
 mpc52xx_uart_int_rx_chars(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	unsigned char ch, flag;
 	unsigned short status;
 
@@ -1000,7 +999,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port)
 	}
 
 	spin_unlock(&port->lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 	spin_lock(&port->lock);
 
 	return psc_ops->raw_rx_rdy(port);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 6f2d2ce..bc24f49 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -938,7 +938,6 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 {
 	struct mpsc_rx_desc *rxre;
 	struct tty_port *port = &pi->port.state->port;
-	struct tty_struct *tty = port->tty;
 	u32	cmdstat, bytes_in, i;
 	int	rc = 0;
 	u8	*bp;
@@ -971,7 +970,7 @@ static int mpsc_rx_intr(struct mpsc_port_info *pi)
 		/* Following use of tty struct directly is deprecated */
 		if (tty_buffer_request_room(port, bytes_in) < bytes_in) {
 			if (port->low_latency)
-				tty_flip_buffer_push(tty);
+				tty_flip_buffer_push(port);
 			/*
 			 * If this failed then we will throw away the bytes
 			 * but must do so to clear interrupts.
@@ -1081,7 +1080,7 @@ next_frame:
 	if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
 		mpsc_start_rx(pi);
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 	return rc;
 }
 
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 4632db7..f641c23 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -340,7 +340,6 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 {
 	struct uart_port *port = &max->port;
 	struct tty_port *tport;
-	struct tty_struct *tty;
 	char buf[M3110_RX_FIFO_DEPTH];
 	int r, w, usable;
 
@@ -349,9 +348,6 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 		return 0;
 
 	tport = &port->state->port;
-	tty = tty_port_tty_get(tport);
-	if (!tty)
-		return 0;
 
 	for (r = 0, w = 0; r < len; r++) {
 		if (str[r] & MAX3110_BREAK &&
@@ -366,10 +362,8 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 		}
 	}
 
-	if (!w) {
-		tty_kref_put(tty);
+	if (!w)
 		return 0;
-	}
 
 	for (r = 0; w; r += usable, w -= usable) {
 		usable = tty_buffer_request_room(tport, w);
@@ -378,8 +372,7 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 			port->icount.rx += usable;
 		}
 	}
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(tport);
 
 	return r;
 }
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index cb787c0..b11e997 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -92,7 +92,6 @@ static void msm_enable_ms(struct uart_port *port)
 static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	unsigned int sr;
 	int count = 0;
 	struct msm_port *msm_port = UART_TO_MSM(port);
@@ -138,7 +137,7 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 		count -= 4;
 	}
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 	if (misr & (UART_IMR_RXSTALE))
 		msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
 	msm_write(port, 0xFFFFFF, UARTDM_DMRX);
@@ -148,7 +147,6 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 static void handle_rx(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	unsigned int sr;
 
 	/*
@@ -191,7 +189,7 @@ static void handle_rx(struct uart_port *port)
 			tty_insert_flip_char(tport, c, flag);
 	}
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 }
 
 static void reset_dm_count(struct uart_port *port)
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
index c356fff..4a942c7 100644
--- a/drivers/tty/serial/msm_serial_hs.c
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -981,9 +981,8 @@ static void msm_hs_tty_flip_buffer_work(struct work_struct *work)
 {
 	struct msm_hs_port *msm_uport =
 			container_of(work, struct msm_hs_port, rx.tty_work);
-	struct tty_struct *tty = msm_uport->uport.state->port.tty;
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&msm_uport->uport.state->port);
 }
 
 /*
diff --git a/drivers/tty/serial/msm_smd_tty.c b/drivers/tty/serial/msm_smd_tty.c
index b43b4ec..e722ff1 100644
--- a/drivers/tty/serial/msm_smd_tty.c
+++ b/drivers/tty/serial/msm_smd_tty.c
@@ -80,7 +80,7 @@ static void smd_tty_notify(void *priv, unsigned event)
 			pr_err("OOPS - smd_tty_buffer mismatch?!");
 		}
 
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&info->port);
 	}
 
 	/* XXX only when writable and necessary */
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 83b2168..7fd6aaa 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -244,7 +244,6 @@ static void mux_read(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
 	int data;
-	struct tty_struct *tty = tport->tty;
 	__u32 start_count = port->icount.rx;
 
 	while(1) {
@@ -270,9 +269,8 @@ static void mux_read(struct uart_port *port)
 		tty_insert_flip_char(tport, data & 0xFF, TTY_NORMAL);
 	}
 	
-	if (start_count != port->icount.rx) {
-		tty_flip_buffer_push(tty);
-	}
+	if (start_count != port->icount.rx)
+		tty_flip_buffer_push(tport);
 }
 
 /**
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 37a0046..df0ba32 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -364,7 +364,6 @@ out:
 
 static void mxs_auart_rx_chars(struct mxs_auart_port *s)
 {
-	struct tty_struct *tty = s->port.state->port.tty;
 	u32 stat = 0;
 
 	for (;;) {
@@ -375,7 +374,7 @@ static void mxs_auart_rx_chars(struct mxs_auart_port *s)
 	}
 
 	writel(stat, s->port.membase + AUART_STAT);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&s->port.state->port);
 }
 
 static int mxs_auart_request_port(struct uart_port *u)
@@ -458,7 +457,6 @@ static void dma_rx_callback(void *arg)
 {
 	struct mxs_auart_port *s = (struct mxs_auart_port *) arg;
 	struct tty_port *port = &s->port.state->port;
-	struct tty_struct *tty = port->tty;
 	int count;
 	u32 stat;
 
@@ -472,7 +470,7 @@ static void dma_rx_callback(void *arg)
 	tty_insert_flip_string(port, s->rx_dma_buf, count);
 
 	writel(stat, s->port.membase + AUART_STAT);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 
 	/* start the next DMA for RX. */
 	mxs_auart_dma_prep_rx(s);
diff --git a/drivers/tty/serial/netx-serial.c b/drivers/tty/serial/netx-serial.c
index d40da78..b9a40ed 100644
--- a/drivers/tty/serial/netx-serial.c
+++ b/drivers/tty/serial/netx-serial.c
@@ -199,7 +199,6 @@ static void netx_txint(struct uart_port *port)
 static void netx_rxint(struct uart_port *port)
 {
 	unsigned char rx, flg, status;
-	struct tty_struct *tty = port->state->port.tty;
 
 	while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
 		rx = readl(port->membase + UART_DR);
@@ -237,8 +236,7 @@ static void netx_rxint(struct uart_port *port)
 		uart_insert_char(port, status, SR_OE, rx, flg);
 	}
 
-	tty_flip_buffer_push(tty);
-	return;
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static irqreturn_t netx_int(int irq, void *dev_id)
diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
index 10d64a3..77287c5 100644
--- a/drivers/tty/serial/nwpserial.c
+++ b/drivers/tty/serial/nwpserial.c
@@ -129,7 +129,6 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
 {
 	struct nwpserial_port *up = dev_id;
 	struct tty_port *port = &up->port.state->port;
-	struct tty_struct *tty = port->tty;
 	irqreturn_t ret;
 	unsigned int iir;
 	unsigned char ch;
@@ -150,7 +149,7 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
 			tty_insert_flip_char(port, ch, TTY_NORMAL);
 	} while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(port);
 	ret = IRQ_HANDLED;
 
 	/* clear interrupt */
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index ec90651..6f3dbf7 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -483,7 +483,6 @@ static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 {
 	struct uart_omap_port *up = dev_id;
-	struct tty_struct *tty = up->port.state->port.tty;
 	unsigned int iir, lsr;
 	unsigned int type;
 	irqreturn_t ret = IRQ_NONE;
@@ -530,7 +529,7 @@ static irqreturn_t serial_omap_irq(int irq, void *dev_id)
 
 	spin_unlock(&up->port.lock);
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&up->port.state->port);
 
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 967f1cb..8b40a1f 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -593,17 +593,9 @@ static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
 {
 	struct uart_port *port = &priv->port;
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty;
-
-	tty = tty_port_tty_get(tport);
-	if (!tty) {
-		dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
-		return -EBUSY;
-	}
 
 	tty_insert_flip_string(tport, buf, size);
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(tport);
 
 	return 0;
 }
@@ -744,19 +736,12 @@ static void pch_dma_rx_complete(void *arg)
 {
 	struct eg20t_port *priv = arg;
 	struct uart_port *port = &priv->port;
-	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
 	int count;
 
-	if (!tty) {
-		dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
-		return;
-	}
-
 	dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
 	count = dma_push_rx(priv, priv->trigger_level);
 	if (count)
-		tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+		tty_flip_buffer_push(&port->state->port);
 	async_tx_ack(priv->desc_rx);
 	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
 					    PCH_UART_HAL_RX_ERR_INT);
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 73a3f29..b1785f5 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -227,21 +227,19 @@ static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
 	write_zsreg(uap, R1, uap->curregs[1]);
 }
 
-static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
+static bool pmz_receive_chars(struct uart_pmac_port *uap)
 {
 	struct tty_port *port;
-	struct tty_struct *tty = NULL;
 	unsigned char ch, r1, drop, error, flag;
 	int loops = 0;
 
 	/* Sanity check, make sure the old bug is no longer happening */
-	if (uap->port.state == NULL || uap->port.state->port.tty == NULL) {
+	if (uap->port.state == NULL) {
 		WARN_ON(1);
 		(void)read_zsdata(uap);
-		return NULL;
+		return false;
 	}
 	port = &uap->port.state->port;
-	tty = port->tty; /* TOCTOU above */
 
 	while (1) {
 		error = 0;
@@ -330,11 +328,11 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
 			break;
 	}
 
-	return tty;
+	return true;
  flood:
 	pmz_interrupt_control(uap, 0);
 	pmz_error("pmz: rx irq flood !\n");
-	return tty;
+	return true;
 }
 
 static void pmz_status_handle(struct uart_pmac_port *uap)
@@ -455,7 +453,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
 	struct uart_pmac_port *uap_a;
 	struct uart_pmac_port *uap_b;
 	int rc = IRQ_NONE;
-	struct tty_struct *tty;
+	bool push;
 	u8 r3;
 
 	uap_a = pmz_get_port_A(uap);
@@ -468,7 +466,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
 	pmz_debug("irq, r3: %x\n", r3);
 #endif
 	/* Channel A */
-	tty = NULL;
+	push = false;
 	if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
 		if (!ZS_IS_OPEN(uap_a)) {
 			pmz_debug("ChanA interrupt while not open !\n");
@@ -479,21 +477,21 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
 		if (r3 & CHAEXT)
 			pmz_status_handle(uap_a);
 		if (r3 & CHARxIP)
-			tty = pmz_receive_chars(uap_a);
+			push = pmz_receive_chars(uap_a);
 		if (r3 & CHATxIP)
 			pmz_transmit_chars(uap_a);
 		rc = IRQ_HANDLED;
 	}
  skip_a:
 	spin_unlock(&uap_a->port.lock);
-	if (tty != NULL)
-		tty_flip_buffer_push(tty);
+	if (push)
+		tty_flip_buffer_push(&uap->port.state->port);
 
 	if (!uap_b)
 		goto out;
 
 	spin_lock(&uap_b->port.lock);
-	tty = NULL;
+	push = false;
 	if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
 		if (!ZS_IS_OPEN(uap_b)) {
 			pmz_debug("ChanB interrupt while not open !\n");
@@ -504,15 +502,15 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
 		if (r3 & CHBEXT)
 			pmz_status_handle(uap_b);
 		if (r3 & CHBRxIP)
-			tty = pmz_receive_chars(uap_b);
+			push = pmz_receive_chars(uap_b);
 		if (r3 & CHBTxIP)
 			pmz_transmit_chars(uap_b);
 		rc = IRQ_HANDLED;
 	}
  skip_b:
 	spin_unlock(&uap_b->port.lock);
-	if (tty != NULL)
-		tty_flip_buffer_push(tty);
+	if (push)
+		tty_flip_buffer_push(&uap->port.state->port);
 
  out:
 	return rc;
diff --git a/drivers/tty/serial/pnx8xxx_uart.c b/drivers/tty/serial/pnx8xxx_uart.c
index 0aa75a9..7e277a5 100644
--- a/drivers/tty/serial/pnx8xxx_uart.c
+++ b/drivers/tty/serial/pnx8xxx_uart.c
@@ -181,7 +181,6 @@ static void pnx8xxx_enable_ms(struct uart_port *port)
 
 static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
 {
-	struct tty_struct *tty = sport->port.state->port.tty;
 	unsigned int status, ch, flg;
 
 	status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
@@ -238,7 +237,7 @@ static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
 		status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
 			 ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
 	}
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&sport->port.state->port);
 }
 
 static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 2764828..3b671bc 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -98,7 +98,6 @@ static void serial_pxa_stop_rx(struct uart_port *port)
 
 static inline void receive_chars(struct uart_pxa_port *up, int *status)
 {
-	struct tty_struct *tty = up->port.state->port.tty;
 	unsigned int ch, flag;
 	int max_count = 256;
 
@@ -168,7 +167,7 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
 	ignore_char:
 		*status = serial_in(up, UART_LSR);
 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&up->port.state->port);
 
 	/* work around Errata #20 according to
 	 * Intel(R) PXA27x Processor Family
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
index 5d4b9b4..af6b3e3 100644
--- a/drivers/tty/serial/sa1100.c
+++ b/drivers/tty/serial/sa1100.c
@@ -188,7 +188,6 @@ static void sa1100_enable_ms(struct uart_port *port)
 static void
 sa1100_rx_chars(struct sa1100_port *sport)
 {
-	struct tty_struct *tty = sport->port.state->port.tty;
 	unsigned int status, ch, flg;
 
 	status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
@@ -233,7 +232,7 @@ sa1100_rx_chars(struct sa1100_port *sport)
 		status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
 			 UTSR0_TO_SM(UART_GET_UTSR0(sport));
 	}
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&sport->port.state->port);
 }
 
 static void sa1100_tx_chars(struct sa1100_port *sport)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 0684529..3aa3c4c 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -220,7 +220,6 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
 {
 	struct s3c24xx_uart_port *ourport = dev_id;
 	struct uart_port *port = &ourport->port;
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned int ufcon, ch, flag, ufstat, uerstat;
 	unsigned long flags;
 	int max_count = 64;
@@ -298,7 +297,7 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
  ignore_char:
 		continue;
 	}
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 
  out:
 	spin_unlock_irqrestore(&port->lock, flags);
diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
index f76b1688..a7cdec2 100644
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -384,7 +384,7 @@ static void sbd_receive_chars(struct sbd_port *sport)
 		uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
 	}
 
-	tty_flip_buffer_push(uport->state->port.tty);
+	tty_flip_buffer_push(&uport->state->port);
 }
 
 static void sbd_transmit_chars(struct sbd_port *sport)
diff --git a/drivers/tty/serial/sc26xx.c b/drivers/tty/serial/sc26xx.c
index 0cd0e4a..c973568 100644
--- a/drivers/tty/serial/sc26xx.c
+++ b/drivers/tty/serial/sc26xx.c
@@ -136,20 +136,17 @@ static void sc26xx_disable_irq(struct uart_port *port, int mask)
 	WRITE_SC(port, IMR, up->imr);
 }
 
-static struct tty_struct *receive_chars(struct uart_port *port)
+static bool receive_chars(struct uart_port *port)
 {
 	struct tty_port *tport = NULL;
-	struct tty_struct *tty = NULL;
 	int limit = 10000;
 	unsigned char ch;
 	char flag;
 	u8 status;
 
 	/* FIXME what is this trying to achieve? */
-	if (port->state != NULL) {		/* Unopened serial console */
+	if (port->state != NULL)		/* Unopened serial console */
 		tport = &port->state->port;
-		tty = tport->tty;
-	}
 
 	while (limit-- > 0) {
 		status = READ_SC_PORT(port, SR);
@@ -191,7 +188,7 @@ static struct tty_struct *receive_chars(struct uart_port *port)
 
 		tty_insert_flip_char(tport, ch, flag);
 	}
-	return tty;
+	return !!tport;
 }
 
 static void transmit_chars(struct uart_port *port)
@@ -221,36 +218,36 @@ static void transmit_chars(struct uart_port *port)
 static irqreturn_t sc26xx_interrupt(int irq, void *dev_id)
 {
 	struct uart_sc26xx_port *up = dev_id;
-	struct tty_struct *tty;
 	unsigned long flags;
+	bool push;
 	u8 isr;
 
 	spin_lock_irqsave(&up->port[0].lock, flags);
 
-	tty = NULL;
+	push = false;
 	isr = READ_SC(&up->port[0], ISR);
 	if (isr & ISR_TXRDYA)
 	    transmit_chars(&up->port[0]);
 	if (isr & ISR_RXRDYA)
-	    tty = receive_chars(&up->port[0]);
+	    push = receive_chars(&up->port[0]);
 
 	spin_unlock(&up->port[0].lock);
 
-	if (tty)
-		tty_flip_buffer_push(tty);
+	if (push)
+		tty_flip_buffer_push(&up->port[0].state->port);
 
 	spin_lock(&up->port[1].lock);
 
-	tty = NULL;
+	push = false;
 	if (isr & ISR_TXRDYB)
 	    transmit_chars(&up->port[1]);
 	if (isr & ISR_RXRDYB)
-	    tty = receive_chars(&up->port[1]);
+	    push = receive_chars(&up->port[1]);
 
 	spin_unlock_irqrestore(&up->port[1].lock, flags);
 
-	if (tty)
-		tty_flip_buffer_push(tty);
+	if (push)
+		tty_flip_buffer_push(&up->port[1].state->port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index 418b495..2ced871 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -285,10 +285,6 @@ static void sccnxp_handle_rx(struct uart_port *port)
 {
 	u8 sr;
 	unsigned int ch, flag;
-	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
-
-	if (!tty)
-		return;
 
 	for (;;) {
 		sr = sccnxp_port_read(port, SCCNXP_SR_REG);
@@ -333,9 +329,7 @@ static void sccnxp_handle_rx(struct uart_port *port)
 		uart_insert_char(port, sr, SR_OVR, ch, flag);
 	}
 
-	tty_flip_buffer_push(tty);
-
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void sccnxp_handle_tx(struct uart_port *port)
diff --git a/drivers/tty/serial/serial_ks8695.c b/drivers/tty/serial/serial_ks8695.c
index 9bd004f..e1caa99 100644
--- a/drivers/tty/serial/serial_ks8695.c
+++ b/drivers/tty/serial/serial_ks8695.c
@@ -153,7 +153,6 @@ static void ks8695uart_disable_ms(struct uart_port *port)
 static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned int status, ch, lsr, flg, max_count = 256;
 
 	status = UART_GET_LSR(port);		/* clears pending LSR interrupts */
@@ -200,7 +199,7 @@ static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
 ignore_char:
 		status = UART_GET_LSR(port);
 	}
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index b52b21a..fe48a0c 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -277,7 +277,6 @@ static void serial_txx9_initialize(struct uart_port *port)
 static inline void
 receive_chars(struct uart_txx9_port *up, unsigned int *status)
 {
-	struct tty_struct *tty = up->port.state->port.tty;
 	unsigned char ch;
 	unsigned int disr = *status;
 	int max_count = 256;
@@ -346,7 +345,7 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 		disr = sio_in(up, TXX9_SIDISR);
 	} while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
 	spin_unlock(&up->port.lock);
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&up->port.state->port);
 	spin_lock(&up->port.lock);
 	*status = disr;
 }
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ecef748..1564186 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -597,7 +597,6 @@ static void sci_receive_chars(struct uart_port *port)
 {
 	struct sci_port *sci_port = to_sci_port(port);
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	int i, count, copied = 0;
 	unsigned short status;
 	unsigned char flag;
@@ -675,7 +674,7 @@ static void sci_receive_chars(struct uart_port *port)
 
 	if (copied) {
 		/* Tell the rest of the system the news. New characters! */
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 	} else {
 		serial_port_in(port, SCxSR); /* dummy read */
 		serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
@@ -722,7 +721,6 @@ static int sci_handle_errors(struct uart_port *port)
 	int copied = 0;
 	unsigned short status = serial_port_in(port, SCxSR);
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct sci_port *s = to_sci_port(port);
 
 	/*
@@ -783,7 +781,7 @@ static int sci_handle_errors(struct uart_port *port)
 	}
 
 	if (copied)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 
 	return copied;
 }
@@ -791,7 +789,6 @@ static int sci_handle_errors(struct uart_port *port)
 static int sci_handle_fifo_overrun(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct sci_port *s = to_sci_port(port);
 	struct plat_sci_reg *reg;
 	int copied = 0;
@@ -806,7 +803,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
 		port->icount.overrun++;
 
 		tty_insert_flip_char(tport, 0, TTY_OVERRUN);
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 
 		dev_notice(port->dev, "overrun error\n");
 		copied++;
@@ -820,7 +817,6 @@ static int sci_handle_breaks(struct uart_port *port)
 	int copied = 0;
 	unsigned short status = serial_port_in(port, SCxSR);
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct sci_port *s = to_sci_port(port);
 
 	if (uart_handle_break(port))
@@ -842,7 +838,7 @@ static int sci_handle_breaks(struct uart_port *port)
 	}
 
 	if (copied)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(tport);
 
 	copied += sci_handle_fifo_overrun(port);
 
@@ -1299,7 +1295,6 @@ static void sci_dma_rx_complete(void *arg)
 {
 	struct sci_port *s = arg;
 	struct uart_port *port = &s->port;
-	struct tty_struct *tty = port->state->port.tty;
 	unsigned long flags;
 	int count;
 
@@ -1314,7 +1309,7 @@ static void sci_dma_rx_complete(void *arg)
 	spin_unlock_irqrestore(&port->lock, flags);
 
 	if (count)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&port->state->port);
 
 	schedule_work(&s->work_rx);
 }
@@ -1408,7 +1403,6 @@ static void work_fn_rx(struct work_struct *work)
 	if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) !=
 	    DMA_SUCCESS) {
 		/* Handle incomplete DMA receive */
-		struct tty_struct *tty = port->state->port.tty;
 		struct dma_chan *chan = s->chan_rx;
 		struct shdma_desc *sh_desc = container_of(desc,
 					struct shdma_desc, async_tx);
@@ -1424,7 +1418,7 @@ static void work_fn_rx(struct work_struct *work)
 		spin_unlock_irqrestore(&port->lock, flags);
 
 		if (count)
-			tty_flip_buffer_push(tty);
+			tty_flip_buffer_push(&port->state->port);
 
 		sci_submit_rx(s);
 
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 142217c..8f3d6c0 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -206,11 +206,6 @@ static unsigned int
 sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
 {
 	unsigned int ch, rx_count = 0;
-	struct tty_struct *tty;
-
-	tty = tty_port_tty_get(&port->state->port);
-	if (!tty)
-		return -ENODEV;
 
 	while (!(rd_regl(port, SIRFUART_RX_FIFO_STATUS) &
 					SIRFUART_FIFOEMPTY_MASK(port))) {
@@ -224,8 +219,7 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
 	}
 
 	port->icount.rx += rx_count;
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(&port->state->port);
 
 	return rx_count;
 }
diff --git a/drivers/tty/serial/sn_console.c b/drivers/tty/serial/sn_console.c
index 283232c..f51ffdc 100644
--- a/drivers/tty/serial/sn_console.c
+++ b/drivers/tty/serial/sn_console.c
@@ -459,7 +459,6 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 {
 	struct tty_port *tport = NULL;
 	int ch;
-	struct tty_struct *tty;
 
 	if (!port) {
 		printk(KERN_ERR "sn_receive_chars - port NULL so can't receive\n");
@@ -474,11 +473,6 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 	if (port->sc_port.state) {
 		/* The serial_core stuffs are initialized, use them */
 		tport = &port->sc_port.state->port;
-		tty = tport->tty;
-	}
-	else {
-		/* Not registered yet - can't pass to tty layer.  */
-		tty = NULL;
 	}
 
 	while (port->sc_ops->sal_input_pending()) {
@@ -518,15 +512,15 @@ sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 #endif /* CONFIG_MAGIC_SYSRQ */
 
 		/* record the character to pass up to the tty layer */
-		if (tty) {
+		if (tport) {
 			if (tty_insert_flip_char(tport, ch, TTY_NORMAL) == 0)
 				break;
 		}
 		port->sc_port.icount.rx++;
 	}
 
-	if (tty)
-		tty_flip_buffer_push(tty);
+	if (tport)
+		tty_flip_buffer_push(tport);
 }
 
 /**
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index defe92b..ba60708 100644
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -181,17 +181,17 @@ static struct sunhv_ops bywrite_ops = {
 
 static struct sunhv_ops *sunhv_ops = &bychar_ops;
 
-static struct tty_struct *receive_chars(struct uart_port *port)
+static struct tty_port *receive_chars(struct uart_port *port)
 {
-	struct tty_struct *tty = NULL;
+	struct tty_port *tport = NULL;
 
 	if (port->state != NULL)		/* Unopened serial console */
-		tty = port->state->port.tty;
+		tport = &port->state->port;
 
 	if (sunhv_ops->receive_chars(port))
 		sun_do_break();
 
-	return tty;
+	return tport;
 }
 
 static void transmit_chars(struct uart_port *port)
@@ -214,16 +214,16 @@ static void transmit_chars(struct uart_port *port)
 static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
-	struct tty_struct *tty;
+	struct tty_port *tport;
 	unsigned long flags;
 
 	spin_lock_irqsave(&port->lock, flags);
-	tty = receive_chars(port);
+	tport = receive_chars(port);
 	transmit_chars(port);
 	spin_unlock_irqrestore(&port->lock, flags);
 
-	if (tty)
-		tty_flip_buffer_push(tty);
+	if (tport)
+		tty_flip_buffer_push(tport);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 4abc4d4..8de2213 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -107,22 +107,19 @@ static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
 		udelay(1);
 }
 
-static struct tty_struct *
+static struct tty_port *
 receive_chars(struct uart_sunsab_port *up,
 	      union sab82532_irq_status *stat)
 {
 	struct tty_port *port = NULL;
-	struct tty_struct *tty = NULL;
 	unsigned char buf[32];
 	int saw_console_brk = 0;
 	int free_fifo = 0;
 	int count = 0;
 	int i;
 
-	if (up->port.state != NULL) {		/* Unopened serial console */
+	if (up->port.state != NULL)		/* Unopened serial console */
 		port = &up->port.state->port;
-		tty = port->tty;
-	}
 
 	/* Read number of BYTES (Character + Status) available. */
 	if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
@@ -139,7 +136,7 @@ receive_chars(struct uart_sunsab_port *up,
 	if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
 		sunsab_cec_wait(up);
 		writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
-		return tty;
+		return port;
 	}
 
 	if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
@@ -219,7 +216,7 @@ receive_chars(struct uart_sunsab_port *up,
 	if (saw_console_brk)
 		sun_do_break();
 
-	return tty;
+	return port;
 }
 
 static void sunsab_stop_tx(struct uart_port *);
@@ -302,7 +299,7 @@ static void check_status(struct uart_sunsab_port *up,
 static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 {
 	struct uart_sunsab_port *up = dev_id;
-	struct tty_struct *tty;
+	struct tty_port *port = NULL;
 	union sab82532_irq_status status;
 	unsigned long flags;
 	unsigned char gis;
@@ -316,12 +313,11 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 	if (gis & 2)
 		status.sreg.isr1 = readb(&up->regs->r.isr1);
 
-	tty = NULL;
 	if (status.stat) {
 		if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
 					 SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_BRK))
-			tty = receive_chars(up, &status);
+			port = receive_chars(up, &status);
 		if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
 		    (status.sreg.isr1 & SAB82532_ISR1_CSC))
 			check_status(up, &status);
@@ -331,8 +327,8 @@ static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
 
 	spin_unlock_irqrestore(&up->port.lock, flags);
 
-	if (tty)
-		tty_flip_buffer_push(tty);
+	if (port)
+		tty_flip_buffer_push(port);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 5232596..e343d66 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -315,11 +315,10 @@ static void sunsu_enable_ms(struct uart_port *port)
 	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
-static struct tty_struct *
+static void
 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 {
 	struct tty_port *port = &up->port.state->port;
-	struct tty_struct *tty = port->tty;
 	unsigned char ch, flag;
 	int max_count = 256;
 	int saw_console_brk = 0;
@@ -391,8 +390,6 @@ receive_chars(struct uart_sunsu_port *up, unsigned char *status)
 
 	if (saw_console_brk)
 		sun_do_break();
-
-	return tty;
 }
 
 static void transmit_chars(struct uart_sunsu_port *up)
@@ -461,20 +458,16 @@ static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
 	spin_lock_irqsave(&up->port.lock, flags);
 
 	do {
-		struct tty_struct *tty;
-
 		status = serial_inp(up, UART_LSR);
-		tty = NULL;
 		if (status & UART_LSR_DR)
-			tty = receive_chars(up, &status);
+			receive_chars(up, &status);
 		check_modem_status(up);
 		if (status & UART_LSR_THRE)
 			transmit_chars(up);
 
 		spin_unlock_irqrestore(&up->port.lock, flags);
 
-		if (tty)
-			tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&up->port.state->port);
 
 		spin_lock_irqsave(&up->port.lock, flags);
 
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 4a11be3..27669ff 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -323,19 +323,15 @@ static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
 	}
 }
 
-static struct tty_struct *
+static struct tty_port *
 sunzilog_receive_chars(struct uart_sunzilog_port *up,
 		       struct zilog_channel __iomem *channel)
 {
 	struct tty_port *port = NULL;
-	struct tty_struct *tty;
 	unsigned char ch, r1, flag;
 
-	tty = NULL;
-	if (up->port.state != NULL) {		/* Unopened serial console */
+	if (up->port.state != NULL)		/* Unopened serial console */
 		port = &up->port.state->port;
-		tty = port->tty;		/* mouse => tty is NULL */
-	}
 
 	for (;;) {
 
@@ -403,7 +399,7 @@ sunzilog_receive_chars(struct uart_sunzilog_port *up,
 			tty_insert_flip_char(port, 0, TTY_OVERRUN);
 	}
 
-	return tty;
+	return port;
 }
 
 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
@@ -536,21 +532,21 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
 	while (up) {
 		struct zilog_channel __iomem *channel
 			= ZILOG_CHANNEL_FROM_PORT(&up->port);
-		struct tty_struct *tty;
+		struct tty_port *port;
 		unsigned char r3;
 
 		spin_lock(&up->port.lock);
 		r3 = read_zsreg(channel, R3);
 
 		/* Channel A */
-		tty = NULL;
+		port = NULL;
 		if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
 			writeb(RES_H_IUS, &channel->control);
 			ZSDELAY();
 			ZS_WSYNC(channel);
 
 			if (r3 & CHARxIP)
-				tty = sunzilog_receive_chars(up, channel);
+				port = sunzilog_receive_chars(up, channel);
 			if (r3 & CHAEXT)
 				sunzilog_status_handle(up, channel);
 			if (r3 & CHATxIP)
@@ -558,22 +554,22 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
 		}
 		spin_unlock(&up->port.lock);
 
-		if (tty)
-			tty_flip_buffer_push(tty);
+		if (port)
+			tty_flip_buffer_push(port);
 
 		/* Channel B */
 		up = up->next;
 		channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
 
 		spin_lock(&up->port.lock);
-		tty = NULL;
+		port = NULL;
 		if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
 			writeb(RES_H_IUS, &channel->control);
 			ZSDELAY();
 			ZS_WSYNC(channel);
 
 			if (r3 & CHBRxIP)
-				tty = sunzilog_receive_chars(up, channel);
+				port = sunzilog_receive_chars(up, channel);
 			if (r3 & CHBEXT)
 				sunzilog_status_handle(up, channel);
 			if (r3 & CHBTxIP)
@@ -581,8 +577,8 @@ static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
 		}
 		spin_unlock(&up->port.lock);
 
-		if (tty)
-			tty_flip_buffer_push(tty);
+		if (port)
+			tty_flip_buffer_push(port);
 
 		up = up->next;
 	}
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index f40c634..6818410 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -100,7 +100,7 @@ static void timbuart_rx_chars(struct uart_port *port)
 	}
 
 	spin_unlock(&port->lock);
-	tty_flip_buffer_push(port->state->port.tty);
+	tty_flip_buffer_push(tport);
 	spin_lock(&port->lock);
 
 	dev_dbg(port->dev, "%s - total read %d bytes\n",
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 5caf1f0..5486505 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -156,7 +156,7 @@ static irqreturn_t ulite_isr(int irq, void *dev_id)
 
 	/* work done? */
 	if (n > 1) {
-		tty_flip_buffer_push(port->state->port.tty);
+		tty_flip_buffer_push(&port->state->port);
 		return IRQ_HANDLED;
 	} else {
 		return IRQ_NONE;
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 7a23786..7355303 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -470,7 +470,6 @@ static void qe_uart_int_rx(struct uart_qe_port *qe_port)
 	unsigned char ch, *cp;
 	struct uart_port *port = &qe_port->port;
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tport->tty;
 	struct qe_bd *bdp;
 	u16 status;
 	unsigned int flg;
@@ -531,7 +530,7 @@ error_return:
 	qe_port->rx_cur = bdp;
 
 	/* Activate BH processing */
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(tport);
 
 	return;
 
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index 62ee016..f655997 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -313,12 +313,10 @@ static void siu_break_ctl(struct uart_port *port, int ctl)
 
 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 {
-	struct tty_struct *tty;
 	uint8_t lsr, ch;
 	char flag;
 	int max_count = RX_MAX_COUNT;
 
-	tty = port->state->port.tty;
 	lsr = *status;
 
 	do {
@@ -365,7 +363,7 @@ static inline void receive_chars(struct uart_port *port, uint8_t *status)
 		lsr = siu_read(port, UART_LSR);
 	} while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 
-	tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&port->state->port);
 
 	*status = lsr;
 }
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 7f41124..f1a398c 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -137,15 +137,6 @@ static void vt8500_enable_ms(struct uart_port *port)
 static void handle_rx(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
-	struct tty_struct *tty = tty_port_tty_get(tport);
-	if (!tty) {
-		/* Discard data: no tty available */
-		int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8;
-		u16 ch;
-		while (count--)
-			ch = readw(port->membase + VT8500_RXFIFO);
-		return;
-	}
 
 	/*
 	 * Handle overrun
@@ -178,8 +169,7 @@ static void handle_rx(struct uart_port *port)
 			tty_insert_flip_char(tport, c, flag);
 	}
 
-	tty_flip_buffer_push(tty);
-	tty_kref_put(tty);
+	tty_flip_buffer_push(tport);
 }
 
 static void handle_tx(struct uart_port *port)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 9ab9103..82a3151 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -147,15 +147,11 @@
 static irqreturn_t xuartps_isr(int irq, void *dev_id)
 {
 	struct uart_port *port = (struct uart_port *)dev_id;
-	struct tty_struct *tty;
 	unsigned long flags;
 	unsigned int isrstatus, numbytes;
 	unsigned int data;
 	char status = TTY_NORMAL;
 
-	/* Get the tty which could be NULL so don't assume it's valid */
-	tty = tty_port_tty_get(&port->state->port);
-
 	spin_lock_irqsave(&port->lock, flags);
 
 	/* Read the interrupt status register to determine which
@@ -187,14 +183,11 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 			} else if (isrstatus & XUARTPS_IXR_OVERRUN)
 				port->icount.overrun++;
 
-			if (tty)
-				uart_insert_char(port, isrstatus,
-						XUARTPS_IXR_OVERRUN, data,
-						status);
+			uart_insert_char(port, isrstatus, XUARTPS_IXR_OVERRUN,
+					data, status);
 		}
 		spin_unlock(&port->lock);
-		if (tty)
-			tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&port->state->port);
 		spin_lock(&port->lock);
 	}
 
@@ -237,7 +230,6 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 
 	/* be sure to release the lock and tty before leaving */
 	spin_unlock_irqrestore(&port->lock, flags);
-	tty_kref_put(tty);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
index 92c00b2..6a16987 100644
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -603,7 +603,7 @@ static void zs_receive_chars(struct zs_port *zport)
 		uart_insert_char(uport, status, Rx_OVR, ch, flag);
 	}
 
-	tty_flip_buffer_push(uport->state->port.tty);
+	tty_flip_buffer_push(&uport->state->port);
 }
 
 static void zs_raw_transmit_chars(struct zs_port *zport)
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 2f6967d..555fdc0 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1439,7 +1439,6 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
 	u16 status;
 	int work = 0;
 	unsigned char DataByte;
- 	struct tty_struct *tty = info->port.tty;
  	struct	mgsl_icount *icount = &info->icount;
 	
 	if ( debug_level >= DEBUG_LEVEL_ISR )	
@@ -1501,7 +1500,7 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
 			if (status & RXSTATUS_BREAK_RECEIVED) {
 				flag = TTY_BREAK;
 				if (info->port.flags & ASYNC_SAK)
-					do_SAK(tty);
+					do_SAK(info->port.tty);
 			} else if (status & RXSTATUS_PARITY_ERROR)
 				flag = TTY_PARITY;
 			else if (status & RXSTATUS_FRAMING_ERROR)
@@ -1524,7 +1523,7 @@ static void mgsl_isr_receive_data( struct mgsl_struct *info )
 	}
 			
 	if(work)
-		tty_flip_buffer_push(tty);
+		tty_flip_buffer_push(&info->port);
 }
 
 /* mgsl_isr_misc()
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 9a0358a..fced6ac 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -1854,7 +1854,6 @@ static void hdlcdev_exit(struct slgt_info *info)
  */
 static void rx_async(struct slgt_info *info)
 {
- 	struct tty_struct *tty = info->port.tty;
  	struct mgsl_icount *icount = &info->icount;
 	unsigned int start, end;
 	unsigned char *p;
@@ -1915,8 +1914,8 @@ static void rx_async(struct slgt_info *info)
 			break;
 	}
 
-	if (tty && chars)
-		tty_flip_buffer_push(tty);
+	if (chars)
+		tty_flip_buffer_push(&info->port);
 }
 
 /*
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 419f58f..e4a2904 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -2167,7 +2167,6 @@ static void isr_rxrdy(SLMP_INFO * info)
 {
 	u16 status;
 	unsigned char DataByte;
- 	struct tty_struct *tty = info->port.tty;
  	struct	mgsl_icount *icount = &info->icount;
 
 	if ( debug_level >= DEBUG_LEVEL_ISR )
@@ -2225,8 +2224,7 @@ static void isr_rxrdy(SLMP_INFO * info)
 			icount->frame,icount->overrun);
 	}
 
-	if ( tty )
-		tty_flip_buffer_push(tty);
+	tty_flip_buffer_push(&info->port);
 }
 
 static void isr_txeom(SLMP_INFO * info, unsigned char status)
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 1bfe97a..b6efaca 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -544,7 +544,7 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
 
 /**
  *	tty_flip_buffer_push	-	terminal
- *	@tty: tty to push
+ *	@port: tty port to push
  *
  *	Queue a push of the terminal flip buffers to the line discipline. This
  *	function must not be called from IRQ context if port->low_latency is
@@ -556,9 +556,9 @@ void tty_flush_to_ldisc(struct tty_struct *tty)
  *	Locking: tty buffer lock. Driver locks in low latency mode.
  */
 
-void tty_flip_buffer_push(struct tty_struct *tty)
+void tty_flip_buffer_push(struct tty_port *port)
 {
-	struct tty_bufhead *buf = &tty->port->buf;
+	struct tty_bufhead *buf = &port->buf;
 	unsigned long flags;
 
 	spin_lock_irqsave(&buf->lock, flags);
@@ -566,7 +566,7 @@ void tty_flip_buffer_push(struct tty_struct *tty)
 		buf->tail->commit = buf->tail->used;
 	spin_unlock_irqrestore(&buf->lock, flags);
 
-	if (tty->port->low_latency)
+	if (port->low_latency)
 		flush_to_ldisc(&buf->work);
 	else
 		schedule_work(&buf->work);