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-rw-r--r--drivers/tty/n_tty.c8
-rw-r--r--drivers/tty/pty.c3
-rw-r--r--drivers/tty/serial/mxs-auart.c38
-rw-r--r--drivers/tty/serial/pch_uart.c29
-rw-r--r--drivers/tty/serial/serial_core.c4
-rw-r--r--drivers/tty/tty_io.c14
6 files changed, 71 insertions, 25 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index d7164bf..687cfe3 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1531,6 +1531,14 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
tty->real_raw = 0;
}
n_tty_set_room(tty);
+ /*
+ * Fix tty hang when I_IXON(tty) is cleared, but the tty
+ * been stopped by STOP_CHAR(tty) before it.
+ */
+ if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) {
+ start_tty(tty);
+ }
+
/* The termios change make the tty ready for I/O */
wake_up_interruptible(&tty->write_wait);
wake_up_interruptible(&tty->read_wait);
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index d19b879..4735928 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -669,6 +669,9 @@ static int ptmx_open(struct inode *inode, struct file *filp)
nonseekable_open(inode, filp);
+ /* We refuse fsnotify events on ptmx, since it's a shared resource */
+ filp->f_mode |= FMODE_NONOTIFY;
+
retval = tty_alloc_file(filp);
if (retval)
return retval;
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 5b3d063..ab7d11e 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -374,11 +374,18 @@ static void mxs_auart_settermios(struct uart_port *u,
static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
{
- u32 istatus, istat;
+ u32 istat;
struct mxs_auart_port *s = context;
u32 stat = readl(s->port.membase + AUART_STAT);
- istatus = istat = readl(s->port.membase + AUART_INTR);
+ istat = readl(s->port.membase + AUART_INTR);
+
+ /* ack irq */
+ writel(istat & (AUART_INTR_RTIS
+ | AUART_INTR_TXIS
+ | AUART_INTR_RXIS
+ | AUART_INTR_CTSMIS),
+ s->port.membase + AUART_INTR_CLR);
if (istat & AUART_INTR_CTSMIS) {
uart_handle_cts_change(&s->port, stat & AUART_STAT_CTS);
@@ -397,12 +404,6 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
istat &= ~AUART_INTR_TXIS;
}
- writel(istatus & (AUART_INTR_RTIS
- | AUART_INTR_TXIS
- | AUART_INTR_RXIS
- | AUART_INTR_CTSMIS),
- s->port.membase + AUART_INTR_CLR);
-
return IRQ_HANDLED;
}
@@ -542,7 +543,7 @@ auart_console_write(struct console *co, const char *str, unsigned int count)
struct mxs_auart_port *s;
struct uart_port *port;
unsigned int old_ctrl0, old_ctrl2;
- unsigned int to = 1000;
+ unsigned int to = 20000;
if (co->index > MXS_AUART_PORTS || co->index < 0)
return;
@@ -563,18 +564,23 @@ auart_console_write(struct console *co, const char *str, unsigned int count)
uart_console_write(port, str, count, mxs_auart_console_putchar);
- /*
- * Finally, wait for transmitter to become empty
- * and restore the TCR
- */
+ /* Finally, wait for transmitter to become empty ... */
while (readl(port->membase + AUART_STAT) & AUART_STAT_BUSY) {
+ udelay(1);
if (!to--)
break;
- udelay(1);
}
- writel(old_ctrl0, port->membase + AUART_CTRL0);
- writel(old_ctrl2, port->membase + AUART_CTRL2);
+ /*
+ * ... and restore the TCR if we waited long enough for the transmitter
+ * to be idle. This might keep the transmitter enabled although it is
+ * unused, but that is better than to disable it while it is still
+ * transmitting.
+ */
+ if (!(readl(port->membase + AUART_STAT) & AUART_STAT_BUSY)) {
+ writel(old_ctrl0, port->membase + AUART_CTRL0);
+ writel(old_ctrl2, port->membase + AUART_CTRL2);
+ }
clk_disable(s->clk);
}
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 73038ba..78c26ca 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -935,22 +935,37 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
{
u8 fcr = ioread8(priv->membase + UART_FCR);
+ struct uart_port *port = &priv->port;
+ struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+ char *error_msg[5] = {};
+ int i = 0;
/* Reset FIFO */
fcr |= UART_FCR_CLEAR_RCVR;
iowrite8(fcr, priv->membase + UART_FCR);
if (lsr & PCH_UART_LSR_ERR)
- dev_err(&priv->pdev->dev, "Error data in FIFO\n");
+ error_msg[i++] = "Error data in FIFO\n";
- if (lsr & UART_LSR_FE)
- dev_err(&priv->pdev->dev, "Framing Error\n");
+ if (lsr & UART_LSR_FE) {
+ port->icount.frame++;
+ error_msg[i++] = " Framing Error\n";
+ }
- if (lsr & UART_LSR_PE)
- dev_err(&priv->pdev->dev, "Parity Error\n");
+ if (lsr & UART_LSR_PE) {
+ port->icount.parity++;
+ error_msg[i++] = " Parity Error\n";
+ }
- if (lsr & UART_LSR_OE)
- dev_err(&priv->pdev->dev, "Overrun Error\n");
+ if (lsr & UART_LSR_OE) {
+ port->icount.overrun++;
+ error_msg[i++] = " Overrun Error\n";
+ }
+
+ if (tty == NULL) {
+ for (i = 0; error_msg[i] != NULL; i++)
+ dev_err(&priv->pdev->dev, error_msg[i]);
+ }
}
static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index dca63e8..f512dc4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1920,6 +1920,8 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
mutex_unlock(&port->mutex);
return 0;
}
+ put_device(tty_dev);
+
if (console_suspend_enabled || !uart_console(uport))
uport->suspended = 1;
@@ -1985,9 +1987,11 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
disable_irq_wake(uport->irq);
uport->irq_wake = 0;
}
+ put_device(tty_dev);
mutex_unlock(&port->mutex);
return 0;
}
+ put_device(tty_dev);
uport->suspended = 0;
/*
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index b44aef0..cf32a5c 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -939,6 +939,14 @@ void start_tty(struct tty_struct *tty)
EXPORT_SYMBOL(start_tty);
+/* We limit tty time update visibility to every 8 seconds or so. */
+static void tty_update_time(struct timespec *time)
+{
+ unsigned long sec = get_seconds() & ~7;
+ if ((long)(sec - time->tv_sec) > 0)
+ time->tv_sec = sec;
+}
+
/**
* tty_read - read method for tty device files
* @file: pointer to tty file
@@ -975,8 +983,10 @@ static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
else
i = -EIO;
tty_ldisc_deref(ld);
+
if (i > 0)
- inode->i_atime = current_fs_time(inode->i_sb);
+ tty_update_time(&inode->i_atime);
+
return i;
}
@@ -1079,7 +1089,7 @@ static inline ssize_t do_tty_write(
}
if (written) {
struct inode *inode = file->f_path.dentry->d_inode;
- inode->i_mtime = current_fs_time(inode->i_sb);
+ tty_update_time(&inode->i_mtime);
ret = written;
}
out:
generated by cgit v1.1 at 2025-01-08 21:16:02 +0000