[ALSA] Fix possible races at free_irq in PCI drivers
The irq handler of PCI drivers must be released before releasing other
resources since the handler for a shared irq can be still called and
may access the freed resource again.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 15db810..faf674e 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -985,18 +985,15 @@
/* reset channels */
for (i = 0; i < chip->bdbars_count; i++)
iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
- /* --- */
+ __hw_end:
if (chip->irq >= 0)
- synchronize_irq(chip->irq);
- __hw_end:
+ free_irq(chip->irq, chip);
if (chip->bdbars.area)
snd_dma_free_pages(&chip->bdbars);
if (chip->addr)
pci_iounmap(chip->pci, chip->addr);
if (chip->bmaddr)
pci_iounmap(chip->pci, chip->bmaddr);
- if (chip->irq >= 0)
- free_irq(chip->irq, chip);
pci_release_regions(chip->pci);
pci_disable_device(chip->pci);
kfree(chip);
@@ -1018,7 +1015,6 @@
snd_pcm_suspend_all(chip->pcm[i]);
snd_ac97_suspend(chip->ac97);
if (chip->irq >= 0) {
- synchronize_irq(chip->irq);
free_irq(chip->irq, chip);
chip->irq = -1;
}