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authorTakashi Iwai <tiwai@suse.de>2005-11-18 18:52:14 +0100
committerJaroslav Kysela <perex@suse.cz>2006-01-03 12:29:08 +0100
commitb32425ac93370e1ba5556110e662f896b2e143b3 (patch)
treec5837ee90c16d2aa358e399f2ad79ca4eb770e94 /sound/drivers
parent2eb061f41cf74f829bfe90a9c79c765172be9f0b (diff)
[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.c10
-rw-r--r--sound/drivers/mpu401/mpu401_uart.c5
-rw-r--r--sound/drivers/opl3/opl3_midi.c5
3 files changed, 11 insertions, 9 deletions
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index a276f7c8036..18611757174 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 ee67b522d25..8687ae3c66b 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 48c480e050c..1b6f227af37 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);
}
/*