4.4-stable review patch. If anyone has any objections, please let me know.
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From: Charles Keepax ckeepax@opensource.cirrus.com
commit 4f2ab5e1d13d6aa77c55f4914659784efd776eb4 upstream.
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: 49bb6402f1aa ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/sound/compress_driver.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/include/sound/compress_driver.h +++ b/include/sound/compress_driver.h @@ -178,7 +178,11 @@ static inline void snd_compr_drain_notif 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); }