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ALSA: ice1724 - Check for ac97 to avoid kernel oops

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Cards with identical PCI ids but no AC97 config in EEPROM do not have
the ac97 field initialized. We must check for this case to avoid kernel oops.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pavel Hofman 2012-01-05 23:05:18 +01:00 committed by Takashi Iwai
parent dcc2cf7507
commit e7848163aa
1 changed files with 5 additions and 2 deletions
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7
sound/pci/ice1712/amp.c
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@ -68,8 +68,11 @@ static int __devinit snd_vt1724_amp_init(struct snd_ice1712 *ice)
static int __devinit snd_vt1724_amp_add_controls(struct snd_ice1712 *ice)
{
/* we use pins 39 and 41 of the VT1616 for left and right read outputs */
snd_ac97_write_cache(ice->ac97, 0x5a, snd_ac97_read(ice->ac97, 0x5a) & ~0x8000);
if (ice->ac97)
/* we use pins 39 and 41 of the VT1616 for left and right
read outputs */
snd_ac97_write_cache(ice->ac97, 0x5a,
snd_ac97_read(ice->ac97, 0x5a) & ~0x8000);
return 0;
}