ALSA: compress: Fix regression on compressed capture streams

A previous fix to the stop handling on compressed capture streams causes
some knock on issues. The previous fix updated snd_compr_drain_notify to
set the state back to PREPARED for capture streams. This causes some
issues however as the handling for snd_compr_poll differs between the
two states and some user-space applications were relying on the poll
failing after the stream had been stopped.

To correct this regression whilst still fixing the original problem the
patch was addressing, update the capture handling to skip the PREPARED
state rather than skipping the SETUP state as it has done until now.

Fixes: 4f2ab5e1d13d ("ALSA: compress: Fix stop handling on compressed capture streams")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
index c5188ff724d1220b991e7e2c1591f8f396138796..bc88d6f964da9e64a03396381cd1d9aab190e9f1 100644 (file)
--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -173,10 +173,7 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
        if (snd_BUG_ON(!stream))
                return;
 
-       if (stream->direction == SND_COMPRESS_PLAYBACK)
-               stream->runtime->state = SNDRV_PCM_STATE_SETUP;
-       else
-               stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
+       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 99b8821587053da0336e58586ca2ec55bff5f0e3..d79aee6b9edd2be05bdc4f7605a142949b7c657b 100644 (file)
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -574,10 +574,7 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
                stream->metadata_set = false;
                stream->next_track = false;
 
-               if (stream->direction == SND_COMPRESS_PLAYBACK)
-                       stream->runtime->state = SNDRV_PCM_STATE_SETUP;
-               else
-                       stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
+               stream->runtime->state = SNDRV_PCM_STATE_SETUP;
        } else {
                return -EPERM;
        }
@@ -693,8 +690,17 @@ static int snd_compr_start(struct snd_compr_stream *stream)
 {
        int retval;
 
-       if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
+       switch (stream->runtime->state) {
+       case SNDRV_PCM_STATE_SETUP:
+               if (stream->direction != SND_COMPRESS_CAPTURE)
+                       return -EPERM;
+               break;
+       case SNDRV_PCM_STATE_PREPARED:
+               break;
+       default:
                return -EPERM;
+       }
+
        retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
        if (!retval)
                stream->runtime->state = SNDRV_PCM_STATE_RUNNING;