ALSA: pcm - Tell user that stream to be rewound is suspended

Return STRPIPE instead of EBADF when userspace attempts to rewind
of forward a stream that was suspended in meanwhile, so that it
can be recovered by snd_pcm_recover().

This was causing Pulseaudio to unload the ALSA sink module under a race
condition when it attempted to rewind the stream right after resume from
suspend, before writing to the stream which would cause it to revive the
stream otherwise. Tested to work with Pulseaudio patched to attempt to
snd_pcm_recover() upon receiving an error from snd_pcm_rewind().

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ac2150e0670d..d89c816ae5bf 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2208,6 +2208,9 @@ static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *subst
         case SNDRV_PCM_STATE_XRUN:
                 ret = -EPIPE;
                 goto __end;
+        case SNDRV_PCM_STATE_SUSPENDED:
+                ret = -ESTRPIPE;
+                goto __end;
         default:
                 ret = -EBADFD;
                 goto __end;
@@ -2253,6 +2256,9 @@ static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substr
         case SNDRV_PCM_STATE_XRUN:
                 ret = -EPIPE;
                 goto __end;
+        case SNDRV_PCM_STATE_SUSPENDED:
+                ret = -ESTRPIPE;
+                goto __end;
         default:
                 ret = -EBADFD;
                 goto __end;
@@ -2299,6 +2305,9 @@ static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *subs
         case SNDRV_PCM_STATE_XRUN:
                 ret = -EPIPE;
                 goto __end;
+        case SNDRV_PCM_STATE_SUSPENDED:
+                ret = -ESTRPIPE;
+                goto __end;
         default:
                 ret = -EBADFD;
                 goto __end;
@@ -2345,6 +2354,9 @@ static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *subst
         case SNDRV_PCM_STATE_XRUN:
                 ret = -EPIPE;
                 goto __end;
+        case SNDRV_PCM_STATE_SUSPENDED:
+                ret = -ESTRPIPE;
+                goto __end;
         default:
                 ret = -EBADFD;
                 goto __end;