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ALSA: AACI: fix multiple IRQ claiming 

Claiming the IRQ each time a playback or capture interface is opened
is wasteful; the second copy of the registered handler is identical to
the first and just wastes resources.  Track the number of opens and
only register the handler when necessary.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-01-25 15:52:33 +00:00
parent 250c7a61c3
commit b60fb519d7
2 changed files with 17 additions and 9 deletions
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24
sound/arm/aaci.c
View File

@ -370,7 +370,7 @@ static int __aaci_pcm_open(struct aaci *aaci,
struct aaci_runtime *aacirun)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
int ret = 0;
aacirun->substream = substream;
runtime->private_data = aacirun;
@ -391,14 +391,15 @@ static int __aaci_pcm_open(struct aaci *aaci,
*/
runtime->hw.fifo_size = aaci->fifosize * 2;
ret = request_irq(aaci->dev->irq[0], aaci_irq, IRQF_SHARED|IRQF_DISABLED,
DRIVER_NAME, aaci);
if (ret)
goto out;
mutex_lock(&aaci->irq_lock);
if (!aaci->users++) {
ret = request_irq(aaci->dev->irq[0], aaci_irq,
IRQF_SHARED | IRQF_DISABLED, DRIVER_NAME, aaci);
if (ret != 0)
aaci->users--;
}
mutex_unlock(&aaci->irq_lock);
return 0;
out:
return ret;
}
@ -414,7 +415,11 @@ static int aaci_pcm_close(struct snd_pcm_substream *substream)
WARN_ON(aacirun->cr & CR_EN);
aacirun->substream = NULL;
free_irq(aaci->dev->irq[0], aaci);
mutex_lock(&aaci->irq_lock);
if (!--aaci->users)
free_irq(aaci->dev->irq[0], aaci);
mutex_unlock(&aaci->irq_lock);
return 0;
}
@ -943,6 +948,7 @@ static struct aaci * __devinit aaci_init_card(struct amba_device *dev)
aaci = card->private_data;
mutex_init(&aaci->ac97_sem);
mutex_init(&aaci->irq_lock);
aaci->card = card;
aaci->dev = dev;

2
sound/arm/aaci.h
View File

@ -226,6 +226,8 @@ struct aaci {
struct snd_card *card;
void __iomem *base;
unsigned int fifosize;
unsigned int users;
struct mutex irq_lock;
/* AC'97 */
struct mutex ac97_sem;