[ALSA] Fix synchronize_irq() bugs, redundancies

free_irq() calls synchronize_irq() for you, so there is no need for
drivers to manually do the same thing (again).  Thus, calls where
sync-irq immediately precedes free-irq can be simplified.

However, during this audit several bugs were noticed, where free-irq is
preceded by a "irq >= 0" check... but the sync-irq call is not covered
by the same check.

So, where sync-irq could not be eliminated completely, the missing check
was added.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index cadda8d6b70f..15db810d5893 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -986,7 +986,8 @@ static int snd_intel8x0_free(struct intel8x0m *chip)
         for (i = 0; i < chip->bdbars_count; i++)
                 iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
         /* --- */
-        synchronize_irq(chip->irq);
+        if (chip->irq >= 0)
+                synchronize_irq(chip->irq);
       __hw_end:
         if (chip->bdbars.area)
                 snd_dma_free_pages(&chip->bdbars);