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ALSA: compress: Fix stop handling on compressed capture streams 

It is normal user behaviour to start, stop, then start a stream
again without closing it. Currently this works for compressed
playback streams but not capture ones.

The states on a compressed capture stream go directly from OPEN to
PREPARED, unlike a playback stream which moves to SETUP and waits
for a write of data before moving to PREPARED. Currently however,
when a stop is sent the state is set to SETUP for both types of
streams. This leaves a capture stream in the situation where a new
start can't be sent as that requires the state to be PREPARED and
a new set_params can't be sent as that requires the state to be
OPEN. The only option being to close the stream, and then reopen.

Correct this issues by allowing snd_compr_drain_notify to set the
state depending on the stream direction, as we already do in
set_params.

Fixes: 49bb6402f1 ("ALSA: compress_core: Add support for capture streams")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Charles Keepax 2019-02-05 16:29:40 +00:00 committed by Takashi Iwai
parent 3bff2407fb
commit 4f2ab5e1d1
1 changed files with 5 additions and 1 deletions
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6
include/sound/compress_driver.h
View File

@ -173,7 +173,11 @@ 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;
if (stream->direction == SND_COMPRESS_PLAYBACK)
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
else
stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
wake_up(&stream->runtime->sleep);
}