4 files changed, 253 insertions, 209 deletions

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index d9c9635..255ad91 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -632,6 +632,13 @@ static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 	return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 }
 
+static inline
+snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
+{
+	snd_pcm_uframes_t ptr = runtime->status->hw_ptr;
+	return ptr - (ptr % runtime->period_size);
+}
+
 /* define extended formats in the recent OSS versions (if any) */
 /* linear formats */
 #define AFMT_S32_LE      0x00001000
@@ -1102,7 +1109,7 @@ static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
 		return err;
 	}
 	runtime->oss.prepare = 0;
-	runtime->oss.prev_hw_ptr_interrupt = 0;
+	runtime->oss.prev_hw_ptr_period = 0;
 	runtime->oss.period_ptr = 0;
 	runtime->oss.buffer_used = 0;
 
@@ -1950,7 +1957,8 @@ static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
 	return result;
 }
 
-static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream, snd_pcm_uframes_t hw_ptr)
+static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
+				      snd_pcm_uframes_t hw_ptr)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t appl_ptr;
@@ -1986,7 +1994,8 @@ static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int tr
 			if (runtime->oss.trigger)
 				goto _skip1;
 			if (atomic_read(&psubstream->mmap_count))
-				snd_pcm_oss_simulate_fill(psubstream, runtime->hw_ptr_interrupt);
+				snd_pcm_oss_simulate_fill(psubstream,
+						get_hw_ptr_period(runtime));
 			runtime->oss.trigger = 1;
 			runtime->start_threshold = 1;
 			cmd = SNDRV_PCM_IOCTL_START;
@@ -2105,11 +2114,12 @@ static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream
 	info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
 	if (atomic_read(&substream->mmap_count)) {
 		snd_pcm_sframes_t n;
-		n = (delay = runtime->hw_ptr_interrupt) - runtime->oss.prev_hw_ptr_interrupt;
+		delay = get_hw_ptr_period(runtime);
+		n = delay - runtime->oss.prev_hw_ptr_period;
 		if (n < 0)
 			n += runtime->boundary;
 		info.blocks = n / runtime->period_size;
-		runtime->oss.prev_hw_ptr_interrupt = delay;
+		runtime->oss.prev_hw_ptr_period = delay;
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			snd_pcm_oss_simulate_fill(substream, delay);
 		info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
@@ -2673,18 +2683,22 @@ static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	if (atomic_read(&substream->mmap_count))
-		return runtime->oss.prev_hw_ptr_interrupt != runtime->hw_ptr_interrupt;
+		return runtime->oss.prev_hw_ptr_period !=
+						get_hw_ptr_period(runtime);
 	else
-		return snd_pcm_playback_avail(runtime) >= runtime->oss.period_frames;
+		return snd_pcm_playback_avail(runtime) >=
+						runtime->oss.period_frames;
 }
 
 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	if (atomic_read(&substream->mmap_count))
-		return runtime->oss.prev_hw_ptr_interrupt != runtime->hw_ptr_interrupt;
+		return runtime->oss.prev_hw_ptr_period !=
+						get_hw_ptr_period(runtime);
 	else
-		return snd_pcm_capture_avail(runtime) >= runtime->oss.period_frames;
+		return snd_pcm_capture_avail(runtime) >=
+						runtime->oss.period_frames;
 }
 
 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 6884ae0..df57a0e 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -921,6 +921,10 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 	snd_free_pages((void*)runtime->control,
 		       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 	kfree(runtime->hw_constraints.rules);
+#ifdef CONFIG_SND_PCM_XRUN_DEBUG
+	if (runtime->hwptr_log)
+		kfree(runtime->hwptr_log);
+#endif
 	kfree(runtime);
 	substream->runtime = NULL;
 	put_pid(substream->pid);
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index b07cc36..0403a7d 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -126,17 +126,6 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 	}
 }
 
-#ifdef CONFIG_SND_PCM_XRUN_DEBUG
-#define xrun_debug(substream, mask)	((substream)->pstr->xrun_debug & (mask))
-#else
-#define xrun_debug(substream, mask)	0
-#endif
-
-#define dump_stack_on_xrun(substream) do {		\
-		if (xrun_debug(substream, 2))		\
-			dump_stack();			\
-	} while (0)
-
 static void pcm_debug_name(struct snd_pcm_substream *substream,
 			   char *name, size_t len)
 {
@@ -147,6 +136,24 @@ static void pcm_debug_name(struct snd_pcm_substream *substream,
 		 substream->number);
 }
 
+#define XRUN_DEBUG_BASIC	(1<<0)
+#define XRUN_DEBUG_STACK	(1<<1)	/* dump also stack */
+#define XRUN_DEBUG_JIFFIESCHECK	(1<<2)	/* do jiffies check */
+#define XRUN_DEBUG_PERIODUPDATE	(1<<3)	/* full period update info */
+#define XRUN_DEBUG_HWPTRUPDATE	(1<<4)	/* full hwptr update info */
+#define XRUN_DEBUG_LOG		(1<<5)	/* show last 10 positions on err */
+#define XRUN_DEBUG_LOGONCE	(1<<6)	/* do above only once */
+
+#ifdef CONFIG_SND_PCM_XRUN_DEBUG
+
+#define xrun_debug(substream, mask) \
+			((substream)->pstr->xrun_debug & (mask))
+
+#define dump_stack_on_xrun(substream) do {			\
+		if (xrun_debug(substream, XRUN_DEBUG_STACK))	\
+			dump_stack();				\
+	} while (0)
+
 static void xrun(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
@@ -154,7 +161,7 @@ static void xrun(struct snd_pcm_substream *substream)
 	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
-	if (xrun_debug(substream, 1)) {
+	if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
 		char name[16];
 		pcm_debug_name(substream, name, sizeof(name));
 		snd_printd(KERN_DEBUG "XRUN: %s\n", name);
@@ -162,32 +169,102 @@ static void xrun(struct snd_pcm_substream *substream)
 	}
 }
 
-static snd_pcm_uframes_t
-snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
-			  struct snd_pcm_runtime *runtime)
-{
+#define hw_ptr_error(substream, fmt, args...)				\
+	do {								\
+		if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {		\
+			xrun_log_show(substream);			\
+			if (printk_ratelimit()) {			\
+				snd_printd("PCM: " fmt, ##args);	\
+			}						\
+			dump_stack_on_xrun(substream);			\
+		}							\
+	} while (0)
+
+#define XRUN_LOG_CNT	10
+
+struct hwptr_log_entry {
+	unsigned long jiffies;
 	snd_pcm_uframes_t pos;
+	snd_pcm_uframes_t period_size;
+	snd_pcm_uframes_t buffer_size;
+	snd_pcm_uframes_t old_hw_ptr;
+	snd_pcm_uframes_t hw_ptr_base;
+};
 
-	pos = substream->ops->pointer(substream);
-	if (pos == SNDRV_PCM_POS_XRUN)
-		return pos; /* XRUN */
-	if (pos >= runtime->buffer_size) {
-		if (printk_ratelimit()) {
-			char name[16];
-			pcm_debug_name(substream, name, sizeof(name));
-			snd_printd(KERN_ERR  "BUG: %s, pos = 0x%lx, "
-				   "buffer size = 0x%lx, period size = 0x%lx\n",
-				   name, pos, runtime->buffer_size,
-				   runtime->period_size);
-		}
-		pos = 0;
+struct snd_pcm_hwptr_log {
+	unsigned int idx;
+	unsigned int hit: 1;
+	struct hwptr_log_entry entries[XRUN_LOG_CNT];
+};
+
+static void xrun_log(struct snd_pcm_substream *substream,
+		     snd_pcm_uframes_t pos)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
+	struct hwptr_log_entry *entry;
+
+	if (log == NULL) {
+		log = kzalloc(sizeof(*log), GFP_ATOMIC);
+		if (log == NULL)
+			return;
+		runtime->hwptr_log = log;
+	} else {
+		if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
+			return;
 	}
-	pos -= pos % runtime->min_align;
-	return pos;
+	entry = &log->entries[log->idx];
+	entry->jiffies = jiffies;
+	entry->pos = pos;
+	entry->period_size = runtime->period_size;
+	entry->buffer_size = runtime->buffer_size;;
+	entry->old_hw_ptr = runtime->status->hw_ptr;
+	entry->hw_ptr_base = runtime->hw_ptr_base;
+	log->idx = (log->idx + 1) % XRUN_LOG_CNT;
 }
 
-static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
-				      struct snd_pcm_runtime *runtime)
+static void xrun_log_show(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
+	struct hwptr_log_entry *entry;
+	char name[16];
+	unsigned int idx;
+	int cnt;
+
+	if (log == NULL)
+		return;
+	if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
+		return;
+	pcm_debug_name(substream, name, sizeof(name));
+	for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
+		entry = &log->entries[idx];
+		if (entry->period_size == 0)
+			break;
+		snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
+			   "hwptr=%ld/%ld\n",
+			   name, entry->jiffies, (unsigned long)entry->pos,
+			   (unsigned long)entry->period_size,
+			   (unsigned long)entry->buffer_size,
+			   (unsigned long)entry->old_hw_ptr,
+			   (unsigned long)entry->hw_ptr_base);
+		idx++;
+		idx %= XRUN_LOG_CNT;
+	}
+	log->hit = 1;
+}
+
+#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
+
+#define xrun_debug(substream, mask)	0
+#define xrun(substream)			do { } while (0)
+#define hw_ptr_error(substream, fmt, args...) do { } while (0)
+#define xrun_log(substream, pos)	do { } while (0)
+#define xrun_log_show(substream)	do { } while (0)
+
+#endif
+
+int snd_pcm_update_state(struct snd_pcm_substream *substream,
+			 struct snd_pcm_runtime *runtime)
 {
 	snd_pcm_uframes_t avail;
 
@@ -208,89 +285,96 @@ static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 			return -EPIPE;
 		}
 	}
-	if (avail >= runtime->control->avail_min)
+	if (!runtime->nowake && avail >= runtime->control->avail_min)
 		wake_up(&runtime->sleep);
 	return 0;
 }
 
-#define hw_ptr_error(substream, fmt, args...)				\
-	do {								\
-		if (xrun_debug(substream, 1)) {				\
-			if (printk_ratelimit()) {			\
-				snd_printd("PCM: " fmt, ##args);	\
-			}						\
-			dump_stack_on_xrun(substream);			\
-		}							\
-	} while (0)
-
-static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
+static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
+				  unsigned int in_interrupt)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t pos;
-	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
+	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 	snd_pcm_sframes_t hdelta, delta;
 	unsigned long jdelta;
 
 	old_hw_ptr = runtime->status->hw_ptr;
-	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
+	pos = substream->ops->pointer(substream);
 	if (pos == SNDRV_PCM_POS_XRUN) {
 		xrun(substream);
 		return -EPIPE;
 	}
-	if (xrun_debug(substream, 8)) {
-		char name[16];
-		pcm_debug_name(substream, name, sizeof(name));
-		snd_printd("period_update: %s: pos=0x%x/0x%x/0x%x, "
-			   "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
-			   name, (unsigned int)pos,
-			   (unsigned int)runtime->period_size,
-			   (unsigned int)runtime->buffer_size,
-			   (unsigned long)old_hw_ptr,
-			   (unsigned long)runtime->hw_ptr_base,
-			   (unsigned long)runtime->hw_ptr_interrupt);
+	if (pos >= runtime->buffer_size) {
+		if (printk_ratelimit()) {
+			char name[16];
+			pcm_debug_name(substream, name, sizeof(name));
+			xrun_log_show(substream);
+			snd_printd(KERN_ERR  "BUG: %s, pos = %ld, "
+				   "buffer size = %ld, period size = %ld\n",
+				   name, pos, runtime->buffer_size,
+				   runtime->period_size);
+		}
+		pos = 0;
 	}
+	pos -= pos % runtime->min_align;
+	if (xrun_debug(substream, XRUN_DEBUG_LOG))
+		xrun_log(substream, pos);
 	hw_base = runtime->hw_ptr_base;
 	new_hw_ptr = hw_base + pos;
-	hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
-	delta = new_hw_ptr - hw_ptr_interrupt;
-	if (hw_ptr_interrupt >= runtime->boundary) {
-		hw_ptr_interrupt -= runtime->boundary;
-		if (hw_base < runtime->boundary / 2)
-			/* hw_base was already lapped; recalc delta */
-			delta = new_hw_ptr - hw_ptr_interrupt;
-	}
-	if (delta < 0) {
-		if (runtime->periods == 1 || new_hw_ptr < old_hw_ptr)
-			delta += runtime->buffer_size;
-		if (delta < 0) {
-			hw_ptr_error(substream, 
-				     "Unexpected hw_pointer value "
-				     "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
-				     substream->stream, (long)pos,
-				     (long)hw_ptr_interrupt);
-#if 1
-			/* simply skipping the hwptr update seems more
-			 * robust in some cases, e.g. on VMware with
-			 * inaccurate timer source
-			 */
-			return 0; /* skip this update */
-#else
-			/* rebase to interrupt position */
-			hw_base = new_hw_ptr = hw_ptr_interrupt;
-			/* align hw_base to buffer_size */
-			hw_base -= hw_base % runtime->buffer_size;
-			delta = 0;
-#endif
-		} else {
+	if (in_interrupt) {
+		/* we know that one period was processed */
+		/* delta = "expected next hw_ptr" for in_interrupt != 0 */
+		delta = old_hw_ptr - (old_hw_ptr % runtime->period_size)
+			+ runtime->period_size;
+		if (delta > new_hw_ptr) {
 			hw_base += runtime->buffer_size;
 			if (hw_base >= runtime->boundary)
 				hw_base = 0;
 			new_hw_ptr = hw_base + pos;
+			goto __delta;
 		}
 	}
+	/* new_hw_ptr might be lower than old_hw_ptr in case when */
+	/* pointer crosses the end of the ring buffer */
+	if (new_hw_ptr < old_hw_ptr) {
+		hw_base += runtime->buffer_size;
+		if (hw_base >= runtime->boundary)
+			hw_base = 0;
+		new_hw_ptr = hw_base + pos;
+	}
+      __delta:
+	delta = (new_hw_ptr - old_hw_ptr) % runtime->boundary;
+	if (xrun_debug(substream, in_interrupt ?
+			XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
+		char name[16];
+		pcm_debug_name(substream, name, sizeof(name));
+		snd_printd("%s_update: %s: pos=%u/%u/%u, "
+			   "hwptr=%ld/%ld/%ld/%ld\n",
+			   in_interrupt ? "period" : "hwptr",
+			   name,
+			   (unsigned int)pos,
+			   (unsigned int)runtime->period_size,
+			   (unsigned int)runtime->buffer_size,
+			   (unsigned long)delta,
+			   (unsigned long)old_hw_ptr,
+			   (unsigned long)new_hw_ptr,
+			   (unsigned long)runtime->hw_ptr_base);
+	}
+	/* something must be really wrong */
+	if (delta >= runtime->buffer_size + runtime->period_size) {
+		hw_ptr_error(substream,
+			       "Unexpected hw_pointer value %s"
+			       "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
+			       "old_hw_ptr=%ld)\n",
+				     in_interrupt ? "[Q] " : "[P]",
+				     substream->stream, (long)pos,
+				     (long)new_hw_ptr, (long)old_hw_ptr);
+		return 0;
+	}
 
 	/* Do jiffies check only in xrun_debug mode */
-	if (!xrun_debug(substream, 4))
+	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
 		goto no_jiffies_check;
 
 	/* Skip the jiffies check for hardwares with BATCH flag.
@@ -299,7 +383,7 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 	 */
 	if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 		goto no_jiffies_check;
-	hdelta = new_hw_ptr - old_hw_ptr;
+	hdelta = delta;
 	if (hdelta < runtime->delay)
 		goto no_jiffies_check;
 	hdelta -= runtime->delay;
@@ -308,130 +392,62 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 		delta = jdelta /
 			(((runtime->period_size * HZ) / runtime->rate)
 								+ HZ/100);
+		/* move new_hw_ptr according jiffies not pos variable */
+		new_hw_ptr = old_hw_ptr;
+		/* use loop to avoid checks for delta overflows */
+		/* the delta value is small or zero in most cases */
+		while (delta > 0) {
+			new_hw_ptr += runtime->period_size;
+			if (new_hw_ptr >= runtime->boundary)
+				new_hw_ptr -= runtime->boundary;
+			delta--;
+		}
+		/* align hw_base to buffer_size */
+		hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
+		delta = 0;
 		hw_ptr_error(substream,
-			     "hw_ptr skipping! [Q] "
+			     "hw_ptr skipping! %s"
 			     "(pos=%ld, delta=%ld, period=%ld, "
-			     "jdelta=%lu/%lu/%lu)\n",
+			     "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
+			     in_interrupt ? "[Q] " : "",
 			     (long)pos, (long)hdelta,
 			     (long)runtime->period_size, jdelta,
-			     ((hdelta * HZ) / runtime->rate), delta);
-		hw_ptr_interrupt = runtime->hw_ptr_interrupt +
-				   runtime->period_size * delta;
-		if (hw_ptr_interrupt >= runtime->boundary)
-			hw_ptr_interrupt -= runtime->boundary;
-		/* rebase to interrupt position */
-		hw_base = new_hw_ptr = hw_ptr_interrupt;
-		/* align hw_base to buffer_size */
-		hw_base -= hw_base % runtime->buffer_size;
-		delta = 0;
+			     ((hdelta * HZ) / runtime->rate), delta,
+			     (unsigned long)old_hw_ptr,
+			     (unsigned long)new_hw_ptr);
 	}
  no_jiffies_check:
 	if (delta > runtime->period_size + runtime->period_size / 2) {
 		hw_ptr_error(substream,
-			     "Lost interrupts? "
-			     "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
+			     "Lost interrupts? %s"
+			     "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
+			     "old_hw_ptr=%ld)\n",
+			     in_interrupt ? "[Q] " : "",
 			     substream->stream, (long)delta,
-			     (long)hw_ptr_interrupt);
-		/* rebase hw_ptr_interrupt */
-		hw_ptr_interrupt =
-			new_hw_ptr - new_hw_ptr % runtime->period_size;
+			     (long)new_hw_ptr,
+			     (long)old_hw_ptr);
 	}
-	runtime->hw_ptr_interrupt = hw_ptr_interrupt;
+
+	if (runtime->status->hw_ptr == new_hw_ptr)
+		return 0;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
 		snd_pcm_playback_silence(substream, new_hw_ptr);
 
-	if (runtime->status->hw_ptr == new_hw_ptr)
-		return 0;
-
 	runtime->hw_ptr_base = hw_base;
 	runtime->status->hw_ptr = new_hw_ptr;
 	runtime->hw_ptr_jiffies = jiffies;
 	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 
-	return snd_pcm_update_hw_ptr_post(substream, runtime);
+	return snd_pcm_update_state(substream, runtime);
 }
 
 /* CAUTION: call it with irq disabled */
 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 {
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	snd_pcm_uframes_t pos;
-	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
-	snd_pcm_sframes_t delta;
-	unsigned long jdelta;
-
-	old_hw_ptr = runtime->status->hw_ptr;
-	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
-	if (pos == SNDRV_PCM_POS_XRUN) {
-		xrun(substream);
-		return -EPIPE;
-	}
-	if (xrun_debug(substream, 16)) {
-		char name[16];
-		pcm_debug_name(substream, name, sizeof(name));
-		snd_printd("hw_update: %s: pos=0x%x/0x%x/0x%x, "
-			   "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
-			   name, (unsigned int)pos,
-			   (unsigned int)runtime->period_size,
-			   (unsigned int)runtime->buffer_size,
-			   (unsigned long)old_hw_ptr,
-			   (unsigned long)runtime->hw_ptr_base,
-			   (unsigned long)runtime->hw_ptr_interrupt);
-	}
-
-	hw_base = runtime->hw_ptr_base;
-	new_hw_ptr = hw_base + pos;
-
-	delta = new_hw_ptr - old_hw_ptr;
-	jdelta = jiffies - runtime->hw_ptr_jiffies;
-	if (delta < 0) {
-		delta += runtime->buffer_size;
-		if (delta < 0) {
-			hw_ptr_error(substream, 
-				     "Unexpected hw_pointer value [2] "
-				     "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
-				     substream->stream, (long)pos,
-				     (long)old_hw_ptr, jdelta);
-			return 0;
-		}
-		hw_base += runtime->buffer_size;
-		if (hw_base >= runtime->boundary)
-			hw_base = 0;
-		new_hw_ptr = hw_base + pos;
-	}
-	/* Do jiffies check only in xrun_debug mode */
-	if (!xrun_debug(substream, 4))
-		goto no_jiffies_check;
-	if (delta < runtime->delay)
-		goto no_jiffies_check;
-	delta -= runtime->delay;
-	if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
-		hw_ptr_error(substream,
-			     "hw_ptr skipping! "
-			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
-			     (long)pos, (long)delta,
-			     (long)runtime->period_size, jdelta,
-			     ((delta * HZ) / runtime->rate));
-		return 0;
-	}
- no_jiffies_check:
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
-	    runtime->silence_size > 0)
-		snd_pcm_playback_silence(substream, new_hw_ptr);
-
-	if (runtime->status->hw_ptr == new_hw_ptr)
-		return 0;
-
-	runtime->hw_ptr_base = hw_base;
-	runtime->status->hw_ptr = new_hw_ptr;
-	runtime->hw_ptr_jiffies = jiffies;
-	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
-		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
-
-	return snd_pcm_update_hw_ptr_post(substream, runtime);
+	return snd_pcm_update_hw_ptr0(substream, 0);
 }
 
 /**
@@ -1657,7 +1673,7 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
 
 	snd_pcm_stream_lock_irqsave(substream, flags);
 	if (!snd_pcm_running(substream) ||
-	    snd_pcm_update_hw_ptr_interrupt(substream) < 0)
+	    snd_pcm_update_hw_ptr0(substream, 1) < 0)
 		goto _end;
 
 	if (substream->timer_running)
@@ -1790,6 +1806,7 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 		goto _end_unlock;
 	}
 
+	runtime->nowake = 1;
 	while (size > 0) {
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
@@ -1811,15 +1828,17 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 		if (frames > cont)
 			frames = cont;
 		if (snd_BUG_ON(!frames)) {
+			runtime->nowake = 0;
 			snd_pcm_stream_unlock_irq(substream);
 			return -EINVAL;
 		}
 		appl_ptr = runtime->control->appl_ptr;
 		appl_ofs = appl_ptr % runtime->buffer_size;
 		snd_pcm_stream_unlock_irq(substream);
-		if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
-			goto _end;
+		err = transfer(substream, appl_ofs, data, offset, frames);
 		snd_pcm_stream_lock_irq(substream);
+		if (err < 0)
+			goto _end_unlock;
 		switch (runtime->status->state) {
 		case SNDRV_PCM_STATE_XRUN:
 			err = -EPIPE;
@@ -1848,8 +1867,10 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 		}
 	}
  _end_unlock:
+	runtime->nowake = 0;
+	if (xfer > 0 && err >= 0)
+		snd_pcm_update_state(substream, runtime);
 	snd_pcm_stream_unlock_irq(substream);
- _end:
 	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
 }
 
@@ -2007,6 +2028,7 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		goto _end_unlock;
 	}
 
+	runtime->nowake = 1;
 	while (size > 0) {
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
@@ -2035,15 +2057,17 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		if (frames > cont)
 			frames = cont;
 		if (snd_BUG_ON(!frames)) {
+			runtime->nowake = 0;
 			snd_pcm_stream_unlock_irq(substream);
 			return -EINVAL;
 		}
 		appl_ptr = runtime->control->appl_ptr;
 		appl_ofs = appl_ptr % runtime->buffer_size;
 		snd_pcm_stream_unlock_irq(substream);
-		if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
-			goto _end;
+		err = transfer(substream, appl_ofs, data, offset, frames);
 		snd_pcm_stream_lock_irq(substream);
+		if (err < 0)
+			goto _end_unlock;
 		switch (runtime->status->state) {
 		case SNDRV_PCM_STATE_XRUN:
 			err = -EPIPE;
@@ -2066,8 +2090,10 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		xfer += frames;
 	}
  _end_unlock:
+	runtime->nowake = 0;
+	if (xfer > 0 && err >= 0)
+		snd_pcm_update_state(substream, runtime);
 	snd_pcm_stream_unlock_irq(substream);
- _end:
 	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
 }
 
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 25b0641..a870fe6 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -516,6 +516,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_sw_params *params)
 {
 	struct snd_pcm_runtime *runtime;
+	int err;
 
 	if (PCM_RUNTIME_CHECK(substream))
 		return -ENXIO;
@@ -540,6 +541,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 		if (params->silence_threshold > runtime->buffer_size)
 			return -EINVAL;
 	}
+	err = 0;
 	snd_pcm_stream_lock_irq(substream);
 	runtime->tstamp_mode = params->tstamp_mode;
 	runtime->period_step = params->period_step;
@@ -553,10 +555,10 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 		    runtime->silence_size > 0)
 			snd_pcm_playback_silence(substream, ULONG_MAX);
-		wake_up(&runtime->sleep);
+		err = snd_pcm_update_state(substream, runtime);
 	}
 	snd_pcm_stream_unlock_irq(substream);
-	return 0;
+	return err;
 }
 
 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
@@ -1247,8 +1249,6 @@ static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
 	if (err < 0)
 		return err;
 	runtime->hw_ptr_base = 0;
-	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
-		runtime->status->hw_ptr % runtime->period_size;
 	runtime->silence_start = runtime->status->hw_ptr;
 	runtime->silence_filled = 0;
 	return 0;