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ALSA: PCM - Don't check DMA time-out too shortly

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When the PCM period size is set larger than 10 seconds, currently the
PCM core may abort the operation with DMA-error due to the fixed timeout
for 10 seconds.  A similar problem is seen in the drain operation that
has a fixed timeout of 10 seconds, too.

This patch fixes the timeout length depending on the period size and
rate, also including the consideration of no_period_wakeup flag.

Reported-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2011-05-26 08:09:38 +02:00
parent a331b0c366
commit f2b3614cef
2 changed files with 23 additions and 5 deletions
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13
sound/core/pcm_native.c
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@@ -1481,11 +1481,20 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
break; /* all drained */
init_waitqueue_entry(&wait, current);
add_wait_queue(&to_check->sleep, &wait);
set_current_state(TASK_INTERRUPTIBLE);
snd_pcm_stream_unlock_irq(substream);
up_read(&snd_pcm_link_rwsem);
snd_power_unlock(card);
tout = schedule_timeout(10 * HZ);
if (runtime->no_period_wakeup)
tout = MAX_SCHEDULE_TIMEOUT;
else {
tout = 10;
if (runtime->rate) {
long t = runtime->period_size * 2 / runtime->rate;
tout = max(t, tout);
}
tout = msecs_to_jiffies(tout * 1000);
}
tout = schedule_timeout_interruptible(tout);
snd_power_lock(card);
down_read(&snd_pcm_link_rwsem);
snd_pcm_stream_lock_irq(substream);