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    Subject[PATCH v5 3/3] ALSA: compress: fix partial_drain completion state
    Date
    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)")
    Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
    Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
    Signed-off-by: Vinod Koul <vkoul@kernel.org>
    ---
    include/sound/compress_driver.h | 10 +++++++++-
    sound/core/compress_offload.c | 4 ++++
    2 files changed, 13 insertions(+), 1 deletion(-)

    diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
    index 3df8d8c90191..8d23351f7ad7 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 +189,13 @@ 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;
    + /* 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;
    + }

    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");
    --
    2.26.2
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