diff options
| author | Takashi Iwai <tiwai@suse.de> | 2008-01-08 18:00:04 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2008-01-31 17:29:46 +0100 |
| commit | fa5717f2099aadb2083d5df4d19af8f9685fa03e (patch) | |
| tree | 563694ca22b8dd11467208457ccde81240c080f9 /sound/core | |
| parent | 8ace4f3c9d83fd60e7539526a3a70bf5730db8c0 (diff) | |
| download | lwn-fa5717f2099aadb2083d5df4d19af8f9685fa03e.tar.gz lwn-fa5717f2099aadb2083d5df4d19af8f9685fa03e.zip | |
[ALSA] Fix PCM write blocking
The snd_pcm_lib_write1() may block in some weird condition:
- the stream isn't started
- avail_min is big (e.g. period size)
- partial write up to buffer_size - avail_min
The patch fixes this invalid blocking problem.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_lib.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 48ffa40967a4..f9f9b3fe956e 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1655,8 +1655,11 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) snd_pcm_update_hw_ptr(substream); avail = snd_pcm_playback_avail(runtime); - if (((avail < runtime->control->avail_min && size > avail) || - (size >= runtime->xfer_align && avail < runtime->xfer_align))) { + if (!avail || + (snd_pcm_running(substream) && + ((avail < runtime->control->avail_min && size > avail) || + (size >= runtime->xfer_align && + avail < runtime->xfer_align)))) { wait_queue_t wait; enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state; long tout; |