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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 | |
| parent | 2eb061f41cf74f829bfe90a9c79c765172be9f0b (diff) | |
| download | linux-b32425ac93370e1ba5556110e662f896b2e143b3.tar.gz linux-b32425ac93370e1ba5556110e662f896b2e143b3.tar.bz2 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')
| -rw-r--r-- | sound/drivers/dummy.c | 10 | ||||
| -rw-r--r-- | sound/drivers/mpu401/mpu401_uart.c | 5 | ||||
| -rw-r--r-- | sound/drivers/opl3/opl3_midi.c | 5 |
3 files changed, 11 insertions, 9 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) diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c index ee67b522d259..8687ae3c66b8 100644 --- a/sound/drivers/mpu401/mpu401_uart.c +++ b/sound/drivers/mpu401/mpu401_uart.c @@ -133,12 +133,13 @@ irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id, struct pt_regs *reg static void snd_mpu401_uart_timer(unsigned long data) { struct snd_mpu401 *mpu = (struct snd_mpu401 *)data; + unsigned long flags; - spin_lock(&mpu->timer_lock); + spin_lock_irqsave(&mpu->timer_lock, flags); /*mpu->mode |= MPU401_MODE_TIMER;*/ mpu->timer.expires = 1 + jiffies; add_timer(&mpu->timer); - spin_unlock(&mpu->timer_lock); + spin_unlock_irqrestore(&mpu->timer_lock, flags); if (mpu->rmidi) _snd_mpu401_uart_interrupt(mpu); } diff --git a/sound/drivers/opl3/opl3_midi.c b/sound/drivers/opl3/opl3_midi.c index 48c480e050ce..1b6f227af370 100644 --- a/sound/drivers/opl3/opl3_midi.c +++ b/sound/drivers/opl3/opl3_midi.c @@ -238,10 +238,11 @@ void snd_opl3_timer_func(unsigned long data) { struct snd_opl3 *opl3 = (struct snd_opl3 *)data; + unsigned long flags; int again = 0; int i; - spin_lock(&opl3->sys_timer_lock); + spin_lock_irqsave(&opl3->sys_timer_lock, flags); for (i = 0; i < opl3->max_voices; i++) { struct snd_opl3_voice *vp = &opl3->voices[i]; if (vp->state > 0 && vp->note_off_check) { @@ -257,7 +258,7 @@ void snd_opl3_timer_func(unsigned long data) } else { opl3->sys_timer_status = 0; } - spin_unlock(&opl3->sys_timer_lock); + spin_unlock_irqrestore(&opl3->sys_timer_lock, flags); } /* |