Re: [PATCH 3/3] ALSA: compress: fix partial_drain completion state

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On 19/06/2020 05:54, Vinod Koul wrote:
On partial_drain completion we should be in SNDRV_PCM_STATE_RUNNING
state, so set that for partially draining streams in
snd_compr_drain_notify() and use a flag for partially draining streams

While at it, add locks for stream state change in
snd_compr_drain_notify() as well.

Fixes: f44f2a5417b2 ("ALSA: compress: fix drain calls blocking other compress functions (v6)")
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
---

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>


  include/sound/compress_driver.h | 12 +++++++++++-
  sound/core/compress_offload.c   |  4 ++++
  2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
index 3df8d8c90191..93a5897201ea 100644
--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -66,6 +66,7 @@ struct snd_compr_runtime {
   * @direction: stream direction, playback/recording
   * @metadata_set: metadata set flag, true when set
   * @next_track: has userspace signal next track transition, true when set
+ * @partial_drain: undergoing partial_drain for stream, true when set
   * @private_data: pointer to DSP private data
   * @dma_buffer: allocated buffer if any
   */
@@ -78,6 +79,7 @@ struct snd_compr_stream {
  	enum snd_compr_direction direction;
  	bool metadata_set;
  	bool next_track;
+	bool partial_drain;
  	void *private_data;
  	struct snd_dma_buffer dma_buffer;
  };
@@ -187,7 +189,15 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
  	if (snd_BUG_ON(!stream))
  		return;
- stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+	mutex_lock(&stream->device->lock);
+	/* for partial_drain case we are back to running state on success */
+	if (stream->partial_drain) {
+		stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
+		stream->partial_drain = false; /* clear this flag as well */
+	} else {
+		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+	}
+	mutex_unlock(&stream->device->lock);
wake_up(&stream->runtime->sleep);
  }
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index e618580feac4..1c4b2cf450a0 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -803,6 +803,9 @@ static int snd_compr_stop(struct snd_compr_stream *stream)
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
  	if (!retval) {
+		/* clear flags and stop any drain wait */
+		stream->partial_drain = false;
+		stream->metadata_set = false;
  		snd_compr_drain_notify(stream);
  		stream->runtime->total_bytes_available = 0;
  		stream->runtime->total_bytes_transferred = 0;
@@ -960,6 +963,7 @@ static int snd_compr_partial_drain(struct snd_compr_stream *stream)
  	if (stream->next_track == false)
  		return -EPERM;
+ stream->partial_drain = true;
  	retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
  	if (retval) {
  		pr_debug("Partial drain returned failure\n");




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