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authorTakashi Iwai <tiwai@suse.de>2009-08-20 16:40:16 +0200
committerTakashi Iwai <tiwai@suse.de>2009-08-20 16:40:16 +0200
commit4cdc115fd38b54642e8536a5c2389483bcb9b2e9 (patch)
treee68cfe5e88d155d1a6820b563517dac27b8e6dd6 /sound
parent64f1607ffbbc772685733ea63e6f7f4183df1b16 (diff)
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ALSA: pcm - Fix drain behavior in non-blocking mode
The current PCM core has the following problems regarding PCM draining in non-blocking mode: - the current f_flags isn't checked in snd_pcm_drain(), thus changing the mode dynamically via snd_pcm_nonblock() after open doesn't work. - calling drain in non-blocking mode just return -EAGAIN error, but doesn't provide any way to sync with draining. This patch fixes these issues. - check file->f_flags in snd_pcm_drain() properly - when O_NONBLOCK is set, PCM core sets the stream(s) to DRAIN state but quits ioctl immediately without waiting the whole drain; the caller can sync the drain manually via poll() Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/pcm_lib.c12
-rw-r--r--sound/core/pcm_native.c52
2 files changed, 37 insertions, 27 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 72cfd47af6b..e3e78c7f274 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -197,12 +197,16 @@ static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
avail = snd_pcm_capture_avail(runtime);
if (avail > runtime->avail_max)
runtime->avail_max = avail;
- if (avail >= runtime->stop_threshold) {
- if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
+ if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ if (avail >= runtime->buffer_size) {
snd_pcm_drain_done(substream);
- else
+ return -EPIPE;
+ }
+ } else {
+ if (avail >= runtime->stop_threshold) {
xrun(substream);
- return -EPIPE;
+ return -EPIPE;
+ }
}
if (avail >= runtime->control->avail_min)
wake_up(&runtime->sleep);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ac2150e0670..b08898cbfed 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1343,8 +1343,6 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream,
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
{
- if (substream->f_flags & O_NONBLOCK)
- return -EAGAIN;
substream->runtime->trigger_master = substream;
return 0;
}
@@ -1392,7 +1390,6 @@ static struct action_ops snd_pcm_action_drain_init = {
struct drain_rec {
struct snd_pcm_substream *substream;
wait_queue_t wait;
- snd_pcm_uframes_t stop_threshold;
};
static int snd_pcm_drop(struct snd_pcm_substream *substream);
@@ -1404,13 +1401,15 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream);
* After this call, all streams are supposed to be either SETUP or DRAINING
* (capture only) state.
*/
-static int snd_pcm_drain(struct snd_pcm_substream *substream)
+static int snd_pcm_drain(struct snd_pcm_substream *substream,
+ struct file *file)
{
struct snd_card *card;
struct snd_pcm_runtime *runtime;
struct snd_pcm_substream *s;
int result = 0;
int i, num_drecs;
+ int nonblock = 0;
struct drain_rec *drec, drec_tmp, *d;
card = substream->pcm->card;
@@ -1428,6 +1427,15 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream)
}
}
+ if (file) {
+ if (file->f_flags & O_NONBLOCK)
+ nonblock = 1;
+ } else if (substream->f_flags & O_NONBLOCK)
+ nonblock = 1;
+
+ if (nonblock)
+ goto lock; /* no need to allocate waitqueues */
+
/* allocate temporary record for drain sync */
down_read(&snd_pcm_link_rwsem);
if (snd_pcm_stream_linked(substream)) {
@@ -1449,16 +1457,11 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream)
d->substream = s;
init_waitqueue_entry(&d->wait, current);
add_wait_queue(&runtime->sleep, &d->wait);
- /* stop_threshold fixup to avoid endless loop when
- * stop_threshold > buffer_size
- */
- d->stop_threshold = runtime->stop_threshold;
- if (runtime->stop_threshold > runtime->buffer_size)
- runtime->stop_threshold = runtime->buffer_size;
}
}
up_read(&snd_pcm_link_rwsem);
+ lock:
snd_pcm_stream_lock_irq(substream);
/* resume pause */
if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
@@ -1466,9 +1469,12 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream)
/* pre-start/stop - all running streams are changed to DRAINING state */
result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
- if (result < 0) {
- snd_pcm_stream_unlock_irq(substream);
- goto _error;
+ if (result < 0)
+ goto unlock;
+ /* in non-blocking, we don't wait in ioctl but let caller poll */
+ if (nonblock) {
+ result = -EAGAIN;
+ goto unlock;
}
for (;;) {
@@ -1504,18 +1510,18 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream)
}
}
+ unlock:
snd_pcm_stream_unlock_irq(substream);
- _error:
- for (i = 0; i < num_drecs; i++) {
- d = &drec[i];
- runtime = d->substream->runtime;
- remove_wait_queue(&runtime->sleep, &d->wait);
- runtime->stop_threshold = d->stop_threshold;
+ if (!nonblock) {
+ for (i = 0; i < num_drecs; i++) {
+ d = &drec[i];
+ runtime = d->substream->runtime;
+ remove_wait_queue(&runtime->sleep, &d->wait);
+ }
+ if (drec != &drec_tmp)
+ kfree(drec);
}
-
- if (drec != &drec_tmp)
- kfree(drec);
snd_power_unlock(card);
return result;
@@ -2544,7 +2550,7 @@ static int snd_pcm_common_ioctl1(struct file *file,
return snd_pcm_hw_params_old_user(substream, arg);
#endif
case SNDRV_PCM_IOCTL_DRAIN:
- return snd_pcm_drain(substream);
+ return snd_pcm_drain(substream, file);
case SNDRV_PCM_IOCTL_DROP:
return snd_pcm_drop(substream);
case SNDRV_PCM_IOCTL_PAUSE: