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| author | Takashi Iwai <tiwai@suse.de> | 2005-11-18 18:52:14 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-01-03 12:29:08 +0100 |
| commit | b32425ac93370e1ba5556110e662f896b2e143b3 (patch) | |
| tree | c5837ee90c16d2aa358e399f2ad79ca4eb770e94 /sound/drivers/dummy.c | |
| parent | 2eb061f41cf74f829bfe90a9c79c765172be9f0b (diff) | |
| download | blackbird-op-linux-b32425ac93370e1ba5556110e662f896b2e143b3.tar.gz blackbird-op-linux-b32425ac93370e1ba5556110e662f896b2e143b3.zip | |
[ALSA] Fix possible races in timer callbacks
Fix possible races in timer callbacks.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers/dummy.c')
| -rw-r--r-- | sound/drivers/dummy.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c index a276f7c80360..186117571745 100644 --- a/sound/drivers/dummy.c +++ b/sound/drivers/dummy.c @@ -231,8 +231,9 @@ static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream) static void snd_card_dummy_pcm_timer_function(unsigned long data) { struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data; + unsigned long flags; - spin_lock(&dpcm->lock); + spin_lock_irqsave(&dpcm->lock, flags); dpcm->timer.expires = 1 + jiffies; add_timer(&dpcm->timer); dpcm->pcm_irq_pos += dpcm->pcm_jiffie; @@ -240,11 +241,10 @@ static void snd_card_dummy_pcm_timer_function(unsigned long data) dpcm->pcm_buf_pos %= dpcm->pcm_size; if (dpcm->pcm_irq_pos >= dpcm->pcm_count) { dpcm->pcm_irq_pos %= dpcm->pcm_count; - spin_unlock(&dpcm->lock); + spin_unlock_irqrestore(&dpcm->lock, flags); snd_pcm_period_elapsed(dpcm->substream); - spin_lock(&dpcm->lock); - } - spin_unlock(&dpcm->lock); + } else + spin_unlock_irqrestore(&dpcm->lock, flags); } static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream) |
