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ALSA: hda_intel: fix handling of non-completion stream interrupts 

Check that the interrupt raised for a stream is actually a buffer
completion interrupt before handling it as one.  Otherwise, memory
errors or FIFO xruns would be interpreted as a pointer update and could
break the stream timing.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2010-05-25 09:03:40 +02:00 committed by Takashi Iwai
parent 66668b6fb6
commit 9ef04066b3
1 changed files with 4 additions and 1 deletions
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5
sound/pci/hda/hda_intel.c
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@ -1097,6 +1097,7 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
struct azx *chip = dev_id;
struct azx_dev *azx_dev;
u32 status;
u8 sd_status;
int i, ok;
spin_lock(&chip->reg_lock);
@ -1110,8 +1111,10 @@ static irqreturn_t azx_interrupt(int irq, void *dev_id)
for (i = 0; i < chip->num_streams; i++) {
azx_dev = &chip->azx_dev[i];
if (status & azx_dev->sd_int_sta_mask) {
sd_status = azx_sd_readb(azx_dev, SD_STS);
azx_sd_writeb(azx_dev, SD_STS, SD_INT_MASK);
if (!azx_dev->substream || !azx_dev->running)
if (!azx_dev->substream || !azx_dev->running ||
!(sd_status & SD_INT_COMPLETE))
continue;
/* check whether this IRQ is really acceptable */
ok = azx_position_ok(chip, azx_dev);