[PATCH 1/7] ALSA: pcm: Revert "ALSA: pcm: rewrite snd_pcm_playback_silence()"

[PATCH 1/7] ALSA: pcm: Revert "ALSA: pcm: rewrite snd_pcm_playback_silence()"

[Oswald Buddenhagen]

From: Jaroslav Kysela <perex@perex.cz>

This reverts commit 9f656705c5faa18afb26d922cfc64f9fd103c38d.

There was a regression (in the top-up mode). Unfortunately, the patch
provided from the author of this commit is not easy to review.

Keep the updated and new comments in headers.
Also add a new comment that documents the missed API constraint which
led to the regression.

Reported-by: Jeff Chua <jeff.chua.linux@gmail.com>
Link: https://lore.kernel.org/r/CAAJw_ZsbTVd3Es373x_wTNDF7RknGhCD0r+NKUSwAO7HpLAkYA@mail.gmail.com
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
v2:
- add docu comment
- commit message improvements
---
 sound/core/pcm_lib.c    | 90 ++++++++++++++++++++++++-----------------
 sound/core/pcm_local.h  |  3 +-
 sound/core/pcm_native.c |  6 +--
 3 files changed, 59 insertions(+), 40 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index d21c73944efd..3357ffae635f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -42,56 +42,74 @@ static int fill_silence_frames(struct snd_pcm_substream *substream,
  *
  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  */
-void snd_pcm_playback_silence(struct snd_pcm_substream *substream)
+void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
-	snd_pcm_sframes_t added, hw_avail, frames;
-	snd_pcm_uframes_t noise_dist, ofs, transfer;
+	snd_pcm_uframes_t frames, ofs, transfer;
 	int err;
 
-	added = appl_ptr - runtime->silence_start;
-	if (added) {
-		if (added < 0)
-			added += runtime->boundary;
-		if (added < runtime->silence_filled)
-			runtime->silence_filled -= added;
-		else
-			runtime->silence_filled = 0;
-		runtime->silence_start = appl_ptr;
-	}
-
-	// This will "legitimately" turn negative on underrun, and will be mangled
-	// into a huge number by the boundary crossing handling. The initial state
-	// might also be not quite sane. The code below MUST account for these cases.
-	hw_avail = appl_ptr - runtime->status->hw_ptr;
-	if (hw_avail < 0)
-		hw_avail += runtime->boundary;
-
-	noise_dist = hw_avail + runtime->silence_filled;
 	if (runtime->silence_size < runtime->boundary) {
-		frames = runtime->silence_threshold - noise_dist;
-		if (frames <= 0)
+		snd_pcm_sframes_t noise_dist, n;
+		snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
+		if (runtime->silence_start != appl_ptr) {
+			n = appl_ptr - runtime->silence_start;
+			if (n < 0)
+				n += runtime->boundary;
+			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
+				runtime->silence_filled -= n;
+			else
+				runtime->silence_filled = 0;
+			runtime->silence_start = appl_ptr;
+		}
+		if (runtime->silence_filled >= runtime->buffer_size)
 			return;
+		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
+		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
+			return;
+		frames = runtime->silence_threshold - noise_dist;
 		if (frames > runtime->silence_size)
 			frames = runtime->silence_size;
 	} else {
-		frames = runtime->buffer_size - noise_dist;
-		if (frames <= 0)
-			return;
+		/*
+		 * This filling mode aims at free-running mode (used for example by dmix),
+		 * which doesn't update the application pointer.
+		 */
+		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
+			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
+			if (avail > runtime->buffer_size)
+				avail = runtime->buffer_size;
+			runtime->silence_filled = avail > 0 ? avail : 0;
+			runtime->silence_start = (runtime->status->hw_ptr +
+						  runtime->silence_filled) %
+						 runtime->boundary;
+		} else {
+			ofs = runtime->status->hw_ptr;
+			frames = new_hw_ptr - ofs;
+			if ((snd_pcm_sframes_t)frames < 0)
+				frames += runtime->boundary;
+			runtime->silence_filled -= frames;
+			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
+				runtime->silence_filled = 0;
+				runtime->silence_start = new_hw_ptr;
+			} else {
+				runtime->silence_start = ofs;
+			}
+		}
+		frames = runtime->buffer_size - runtime->silence_filled;
 	}
-
 	if (snd_BUG_ON(frames > runtime->buffer_size))
 		return;
-	ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
-	do {
+	if (frames == 0)
+		return;
+	ofs = runtime->silence_start % runtime->buffer_size;
+	while (frames > 0) {
 		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
 		err = fill_silence_frames(substream, ofs, transfer);
 		snd_BUG_ON(err < 0);
 		runtime->silence_filled += transfer;
 		frames -= transfer;
 		ofs = 0;
-	} while (frames > 0);
+	}
 	snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
 }
 
@@ -425,6 +443,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 		return 0;
 	}
 
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+	    runtime->silence_size > 0)
+		snd_pcm_playback_silence(substream, new_hw_ptr);
+
 	if (in_interrupt) {
 		delta = new_hw_ptr - runtime->hw_ptr_interrupt;
 		if (delta < 0)
@@ -442,10 +464,6 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 		runtime->hw_ptr_wrap += runtime->boundary;
 	}
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
-	    runtime->silence_size > 0)
-		snd_pcm_playback_silence(substream);
-
 	update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
 
 	return snd_pcm_update_state(substream, runtime);
diff --git a/sound/core/pcm_local.h b/sound/core/pcm_local.h
index 42fe3a4e9154..ecb21697ae3a 100644
--- a/sound/core/pcm_local.h
+++ b/sound/core/pcm_local.h
@@ -29,7 +29,8 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream,
 			 struct snd_pcm_runtime *runtime);
 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 
-void snd_pcm_playback_silence(struct snd_pcm_substream *substream);
+void snd_pcm_playback_silence(struct snd_pcm_substream *substream,
+			      snd_pcm_uframes_t new_hw_ptr);
 
 static inline snd_pcm_uframes_t
 snd_pcm_avail(struct snd_pcm_substream *substream)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 3d0c4a5b701b..94185267a7b9 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -958,7 +958,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 	if (snd_pcm_running(substream)) {
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 		    runtime->silence_size > 0)
-			snd_pcm_playback_silence(substream);
+			snd_pcm_playback_silence(substream, ULONG_MAX);
 		err = snd_pcm_update_state(substream, runtime);
 	}
 	snd_pcm_stream_unlock_irq(substream);
@@ -1455,7 +1455,7 @@ static void snd_pcm_post_start(struct snd_pcm_substream *substream,
 	__snd_pcm_set_state(runtime, state);
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
-		snd_pcm_playback_silence(substream);
+		snd_pcm_playback_silence(substream, ULONG_MAX);
 	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
 }
 
@@ -1916,7 +1916,7 @@ static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
 	runtime->control->appl_ptr = runtime->status->hw_ptr;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
-		snd_pcm_playback_silence(substream);
+		snd_pcm_playback_silence(substream, ULONG_MAX);
 	snd_pcm_stream_unlock_irq(substream);
 }
 
-- 
2.40.0.152.g15d061e6df

[PATCH 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode

[Oswald Buddenhagen]

From: Jaroslav Kysela <perex@perex.cz>

The snd_pcm_playback_hw_avail() function uses runtime->status->hw_ptr.
Unfortunately, in case when we call this function from snd_pcm_update_hw_ptr0(),
this variable contains the previous hardware pointer. Use the new_hw_ptr
argument to calculate hw_avail (filled samples by the user space) to
correct the threshold comparison.

The new_hw_ptr argument may also be set to ULONG_MAX which means the
initialization phase. In this case, use runtime->status->hw_ptr.

Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
 sound/core/pcm_lib.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 3357ffae635f..6ad67e7e740c 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -63,7 +63,15 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 		}
 		if (runtime->silence_filled >= runtime->buffer_size)
 			return;
-		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
+		/* initialization outside pointer updates */
+		if (new_hw_ptr == ULONG_MAX)
+			new_hw_ptr = runtime->status->hw_ptr;
+		/* get hw_avail with the boundary crossing */
+		noise_dist = appl_ptr - new_hw_ptr;
+		if (noise_dist < 0)
+			noise_dist += runtime->boundary;
+		/* total noise distance */
+		noise_dist += runtime->silence_filled;
 		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
 			return;
 		frames = runtime->silence_threshold - noise_dist;
-- 
2.40.0.152.g15d061e6df

[PATCH 3/7] ALSA: pcm: fix playback silence - correct incremental silencing

[Oswald Buddenhagen]

From: Jaroslav Kysela <perex@perex.cz>

Commit 9a826ddba6e ("[ALSA] pcm core: fix silence_start calculations")
came with exactly the right commit message, but the patch just made
things broken in a different way: We'd fill at a too low address if the
area was already partially zeroed, so we'd under-fill. This affected
both thresholded mode (where it was somewhat less likely) and top-up
mode (where it would be the case consistently).

Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
v2:
- rewrote commit message
- postponed the addition of comments to a subsequent patch where it
  makes more sense
- dropped the part which the subsequent refactoring obsoletes.
  this reduces the patch to its essentials, making it easier to
  understand, and reducing churn.
---
 sound/core/pcm_lib.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 6ad67e7e740c..5ddb74a12030 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -87,29 +87,25 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 			if (avail > runtime->buffer_size)
 				avail = runtime->buffer_size;
 			runtime->silence_filled = avail > 0 ? avail : 0;
-			runtime->silence_start = (runtime->status->hw_ptr +
-						  runtime->silence_filled) %
-						 runtime->boundary;
+			runtime->silence_start = runtime->status->hw_ptr;
 		} else {
 			ofs = runtime->status->hw_ptr;
 			frames = new_hw_ptr - ofs;
 			if ((snd_pcm_sframes_t)frames < 0)
 				frames += runtime->boundary;
 			runtime->silence_filled -= frames;
 			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
 				runtime->silence_filled = 0;
-				runtime->silence_start = new_hw_ptr;
-			} else {
-				runtime->silence_start = ofs;
 			}
+			runtime->silence_start = new_hw_ptr;
 		}
 		frames = runtime->buffer_size - runtime->silence_filled;
 	}
 	if (snd_BUG_ON(frames > runtime->buffer_size))
 		return;
 	if (frames == 0)
 		return;
-	ofs = runtime->silence_start % runtime->buffer_size;
+	ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
 	while (frames > 0) {
 		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
 		err = fill_silence_frames(substream, ofs, transfer);
-- 
2.40.0.152.g15d061e6df

[PATCH 4/7] ALSA: pcm: playback silence - remove extra code

[Oswald Buddenhagen]

From: Jaroslav Kysela <perex@perex.cz>

The removed condition handles de facto only one situation where
runtime->silence_filled variable is equal to runtime->buffer_size,
because this variable cannot go over the buffer size. This case is
implicitly caught by the required comparison of the noise distance
with the threshold.

Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
v2:
- improved language of commit message
---
 sound/core/pcm_lib.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 5ddb74a12030..a1838130c830 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -61,8 +61,6 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 				runtime->silence_filled = 0;
 			runtime->silence_start = appl_ptr;
 		}
-		if (runtime->silence_filled >= runtime->buffer_size)
-			return;
 		/* initialization outside pointer updates */
 		if (new_hw_ptr == ULONG_MAX)
 			new_hw_ptr = runtime->status->hw_ptr;
-- 
2.40.0.152.g15d061e6df

[PATCH 5/7] ALSA: pcm: playback silence - move silence variable updates to separate function

[Oswald Buddenhagen]

From: Jaroslav Kysela <perex@perex.cz>

The code tracking the added samples in thresholded mode and the code
tracking the just played samples in top-up mode are semantically
identical, so factor it out to a common function to enhance readability.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
v2:
- nicer function name and variable name
- improved language of commit message
---
 sound/core/pcm_lib.c | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index a1838130c830..670572c9a8cc 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -33,6 +33,25 @@
 static int fill_silence_frames(struct snd_pcm_substream *substream,
 			       snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
 
+
+static inline void update_silence_vars(struct snd_pcm_runtime *runtime,
+				       snd_pcm_uframes_t ptr,
+				       snd_pcm_uframes_t new_ptr)
+{
+	snd_pcm_sframes_t delta;
+
+	delta = new_ptr - ptr;
+	if (delta == 0)
+		return;
+	if (delta < 0)
+		delta += runtime->boundary;
+	if ((snd_pcm_uframes_t)delta < runtime->silence_filled)
+		runtime->silence_filled -= delta;
+	else
+		runtime->silence_filled = 0;
+	runtime->silence_start = new_ptr;
+}
+
 /*
  * fill ring buffer with silence
  * runtime->silence_start: starting pointer to silence area
@@ -49,18 +68,9 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 	int err;
 
 	if (runtime->silence_size < runtime->boundary) {
-		snd_pcm_sframes_t noise_dist, n;
+		snd_pcm_sframes_t noise_dist;
 		snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
-		if (runtime->silence_start != appl_ptr) {
-			n = appl_ptr - runtime->silence_start;
-			if (n < 0)
-				n += runtime->boundary;
-			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
-				runtime->silence_filled -= n;
-			else
-				runtime->silence_filled = 0;
-			runtime->silence_start = appl_ptr;
-		}
+		update_silence_vars(runtime, runtime->silence_start, appl_ptr);
 		/* initialization outside pointer updates */
 		if (new_hw_ptr == ULONG_MAX)
 			new_hw_ptr = runtime->status->hw_ptr;
@@ -87,15 +97,7 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 			runtime->silence_filled = avail > 0 ? avail : 0;
 			runtime->silence_start = runtime->status->hw_ptr;
 		} else {
-			ofs = runtime->status->hw_ptr;
-			frames = new_hw_ptr - ofs;
-			if ((snd_pcm_sframes_t)frames < 0)
-				frames += runtime->boundary;
-			runtime->silence_filled -= frames;
-			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
-				runtime->silence_filled = 0;
-			}
-			runtime->silence_start = new_hw_ptr;
+			update_silence_vars(runtime, runtime->status->hw_ptr, new_hw_ptr);
 		}
 		frames = runtime->buffer_size - runtime->silence_filled;
 	}
-- 
2.40.0.152.g15d061e6df

[PATCH 6/7] ALSA: pcm: simplify top-up mode init in snd_pcm_playback_silence()

[Oswald Buddenhagen]

Inline the remaining call of snd_pcm_playback_hw_avail(). This makes
the top-up branch more congruent with the thresholded one, and allows
simplifying the handling of the corner cases.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
 sound/core/pcm_lib.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 670572c9a8cc..17fc80a654be 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -90,15 +90,32 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 		 * This filling mode aims at free-running mode (used for example by dmix),
 		 * which doesn't update the application pointer.
 		 */
-		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
-			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
-			if (avail > runtime->buffer_size)
-				avail = runtime->buffer_size;
-			runtime->silence_filled = avail > 0 ? avail : 0;
-			runtime->silence_start = runtime->status->hw_ptr;
+		snd_pcm_uframes_t hw_ptr = runtime->status->hw_ptr;
+		if (new_hw_ptr == ULONG_MAX) {
+			/*
+			 * Initialization, fill the whole unused buffer with silence.
+			 *
+			 * Usually, this is entered while stopped, before data is queued,
+			 * so both pointers are expected to be zero.
+			 */
+			snd_pcm_sframes_t avail = runtime->control->appl_ptr - hw_ptr;
+			if (avail < 0)
+				avail += runtime->boundary;
+			/*
+			 * In free-running mode, appl_ptr will be zero even while running,
+			 * so we end up with a huge number. There is no useful way to
+			 * handle this, so we just clear the whole buffer.
+			 */
+			runtime->silence_filled = avail > runtime->buffer_size ? 0 : avail;
+			runtime->silence_start = hw_ptr;
 		} else {
-			update_silence_vars(runtime, runtime->status->hw_ptr, new_hw_ptr);
+			/* Silence the just played area immediately */
+			update_silence_vars(runtime, hw_ptr, new_hw_ptr);
 		}
+		/*
+		 * In this mode, silence_filled actually includes the valid
+		 * sample data from the user.
+		 */
 		frames = runtime->buffer_size - runtime->silence_filled;
 	}
 	if (snd_BUG_ON(frames > runtime->buffer_size))
-- 
2.40.0.152.g15d061e6df

[PATCH 7/7] ALSA: pcm: use exit controlled loop in snd_pcm_playback_silence()

[Oswald Buddenhagen]

We already know that `frames` is greater than zero, because we just
checked it. So we don't need to check the loop condition on the first
iteration.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
 sound/core/pcm_lib.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 17fc80a654be..9c121a921b04 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -123,14 +123,14 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
 	if (frames == 0)
 		return;
 	ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
-	while (frames > 0) {
+	do {
 		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
 		err = fill_silence_frames(substream, ofs, transfer);
 		snd_BUG_ON(err < 0);
 		runtime->silence_filled += transfer;
 		frames -= transfer;
 		ofs = 0;
-	}
+	} while (frames > 0);
 	snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
 }
 
-- 
2.40.0.152.g15d061e6df

Re: [PATCH 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode

[Takashi Iwai]

On Fri, 05 May 2023 12:31:35 +0200,
Oswald Buddenhagen wrote:
> 
> From: Jaroslav Kysela <perex@perex.cz>
> 
> The snd_pcm_playback_hw_avail() function uses runtime->status->hw_ptr.
> Unfortunately, in case when we call this function from snd_pcm_update_hw_ptr0(),
> this variable contains the previous hardware pointer. Use the new_hw_ptr
> argument to calculate hw_avail (filled samples by the user space) to
> correct the threshold comparison.
> 
> The new_hw_ptr argument may also be set to ULONG_MAX which means the
> initialization phase. In this case, use runtime->status->hw_ptr.
> 
> Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

Here misses your Signed-off-by tag.  Ditto for the patch 3.
It's a legal requirement, and I can't apply patches without it.

Could you resubmit the series quickly with your SOB?


thanks,

Takashi

Re: [PATCH 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode

[Oswald Buddenhagen]

On Fri, May 05, 2023 at 05:22:57PM +0200, Takashi Iwai wrote:
>On Fri, 05 May 2023 12:31:35 +0200,
>Oswald Buddenhagen wrote:
>> Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
>> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
>> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
>
>Here misses your Signed-off-by tag.  Ditto for the patch 3.
>It's a legal requirement, and I can't apply patches without it.
>
i assumed reviewed-by would be a superset, but apparently it's not.
however, there is no need to add SOB to patches which i only reviewed or 
suggested. i'll adjust the patches to which i made substantial 
modifications, though.

regards

Re: [PATCH 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode

[Takashi Iwai]

On Fri, 05 May 2023 17:52:11 +0200,
Oswald Buddenhagen wrote:
> 
> On Fri, May 05, 2023 at 05:22:57PM +0200, Takashi Iwai wrote:
> > On Fri, 05 May 2023 12:31:35 +0200,
> > Oswald Buddenhagen wrote:
> >> Suggested-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
> >> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
> >> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
> > 
> > Here misses your Signed-off-by tag.  Ditto for the patch 3.
> > It's a legal requirement, and I can't apply patches without it.
> > 
> i assumed reviewed-by would be a superset, but apparently it's not.
> however, there is no need to add SOB to patches which i only reviewed
> or suggested.

SOB is needed by a person who submitted, no matter whether any other
tags are present.  So, it's still mandatory in this case.

> i'll adjust the patches to which i made substantial
> modifications, though.

Great, thanks!


Takashi

Re: [PATCH 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode

[Oswald Buddenhagen]

On Fri, May 05, 2023 at 06:22:15PM +0200, Takashi Iwai wrote:
>On Fri, 05 May 2023 17:52:11 +0200, Oswald Buddenhagen wrote:
>> however, there is no need to add SOB to patches which i only reviewed
>> or suggested.
>
>SOB is needed by a person who submitted, no matter whether any other
>tags are present.  So, it's still mandatory in this case.
>
pedantically, yes. you can link to perex' patch instead, as it's 
literally the same one, sans the reviewed-by.

(i don't think any of this really matters for re-posts of patches that 
have been publicly posted to the same list a few hours prior, as any 
legal challenge could be resolved within minutes anyway.)

regards