[alsa-devel] [PATCH 3/6] ALSA: pcm: Allow dropping stream directly after resume

[Takashi Iwai]

So far, the PCM core refuses DROP ioctl when the stream in the
suspended state.  This was basically to avoid the invalid state change
*during* the suspend.  But since we protect the power change globally
in the common PCM ioctl caller side, it's guaranteed that
snd_pcm_drop() is called at the right power state.  So we can assume
that the drop of stream is safe immediately after SUSPENDED state.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/pcm_native.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index bd1b74aa2068..69cf9b02ac70 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1883,8 +1883,7 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
 	runtime = substream->runtime;
 
 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
-	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
-	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
+	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
 		return -EBADFD;
 
 	snd_pcm_stream_lock_irq(substream);
-- 
2.13.1