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ALSA: pcmtest: stop timer before buffer is released 

Stop timer in the 'trigger' and 'sync_stop' callbacks since we want
the timer to be stopped before the DMA buffer is released. Otherwise,
it could trigger a kernel panic in some circumstances, for instance
when the DMA buffer is already released but the timer callback is
still running.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Link: https://lore.kernel.org/r/20231206223211.12761-1-ivan.orlov0322@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ivan Orlov 2023-12-06 22:32:11 +00:00 committed by Takashi Iwai
parent 8804fa04a4
commit eb99b1b72a
1 changed files with 12 additions and 1 deletions
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13
sound/drivers/pcmtest.c
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@ -397,7 +397,6 @@ static int snd_pcmtst_pcm_close(struct snd_pcm_substream *substream)
struct pcmtst_buf_iter *v_iter = substream->runtime->private_data;
timer_shutdown_sync(&v_iter->timer_instance);
v_iter->substream = NULL;
playback_capture_test = !v_iter->is_buf_corrupted;
kfree(v_iter);
return 0;
@ -435,6 +434,7 @@ static int snd_pcmtst_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
// We can't call timer_shutdown_sync here, as it is forbidden to sleep here
v_iter->suspend = true;
timer_delete(&v_iter->timer_instance);
break;
}
@ -512,12 +512,22 @@ static int snd_pcmtst_ioctl(struct snd_pcm_substream *substream, unsigned int cm
return snd_pcm_lib_ioctl(substream, cmd, arg);
}
static int snd_pcmtst_sync_stop(struct snd_pcm_substream *substream)
{
struct pcmtst_buf_iter *v_iter = substream->runtime->private_data;
timer_delete_sync(&v_iter->timer_instance);
return 0;
}
static const struct snd_pcm_ops snd_pcmtst_playback_ops = {
.open = snd_pcmtst_pcm_open,
.close = snd_pcmtst_pcm_close,
.trigger = snd_pcmtst_pcm_trigger,
.hw_params = snd_pcmtst_pcm_hw_params,
.ioctl = snd_pcmtst_ioctl,
.sync_stop = snd_pcmtst_sync_stop,
.hw_free = snd_pcmtst_pcm_hw_free,
.prepare = snd_pcmtst_pcm_prepare,
.pointer = snd_pcmtst_pcm_pointer,
@ -530,6 +540,7 @@ static const struct snd_pcm_ops snd_pcmtst_capture_ops = {
.hw_params = snd_pcmtst_pcm_hw_params,
.hw_free = snd_pcmtst_pcm_hw_free,
.ioctl = snd_pcmtst_ioctl,
.sync_stop = snd_pcmtst_sync_stop,
.prepare = snd_pcmtst_pcm_prepare,
.pointer = snd_pcmtst_pcm_pointer,
};