From d2ffd5c6c75a3cf01f7712aa7035834858f19185 Mon Sep 17 00:00:00 2001 From: Pavel Hofman Date: Thu, 5 Jan 2012 23:05:18 +0100 Subject: [PATCH] ALSA: ice1724 - Check for ac97 to avoid kernel oops commit e7848163aa2a649d9065f230fadff80dc3519775 upstream. 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 Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/pci/ice1712/amp.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/sound/pci/ice1712/amp.c b/sound/pci/ice1712/amp.c index 6da21a2bcade..95873b54e487 100644 --- a/sound/pci/ice1712/amp.c +++ b/sound/pci/ice1712/amp.c @@ -69,8 +69,11 @@ 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; } -- 2.39.5