In __snd_pcm_lib_xfer(), when capture, if state is PREPARED and size is less than start_threshold nothing can be done. As there is no error, 0 is returned.

Signed-off-by: Ricardo Biehl Pasquali pasqualirb@gmail.com ---

version 3: Set 'err' variable inside 'else' block.

--- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -2173,11 +2173,16 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(str goto _end_unlock;

if (!is_playback && - runtime->status->state == SNDRV_PCM_STATE_PREPARED && - size >= runtime->start_threshold) { - err = snd_pcm_start(substream); - if (err < 0) + runtime->status->state == SNDRV_PCM_STATE_PREPARED) { + if (size >= runtime->start_threshold) { + err = snd_pcm_start(substream); + if (err < 0) + goto _end_unlock; + } else { + /* nothing to do */ + err = 0; goto _end_unlock; + } }

runtime->twake = runtime->control->avail_min ? : 1;