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[ALSA] ac97_codec - trivial fix for bit update functions 

This patch fixes a couple of bit update functions in
alsa-kernel/pci/ac97/ac97_codec.c, which could possibly corrupt bits not
in the given mask.
Specifically, it'll clobber unset bits in the target that are not in the
mask, when the corresponding bit in the given new value is set.

Signed-off-by: James C Georgas <jgeorgas@rogers.com>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
James C Georgas 2006-12-07 08:10:57 +01:00 committed by Jaroslav Kysela
parent d5f6a38d98
commit e8bb036a46
1 changed files with 2 additions and 2 deletions
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4
sound/pci/ac97/ac97_codec.c
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@ -382,7 +382,7 @@ int snd_ac97_update_bits_nolock(struct snd_ac97 *ac97, unsigned short reg,
unsigned short old, new;
old = snd_ac97_read_cache(ac97, reg);
new = (old & ~mask) | value;
new = (old & ~mask) | (value & mask);
change = old != new;
if (change) {
ac97->regs[reg] = new;
@ -399,7 +399,7 @@ static int snd_ac97_ad18xx_update_pcm_bits(struct snd_ac97 *ac97, int codec, uns
mutex_lock(&ac97->page_mutex);
old = ac97->spec.ad18xx.pcmreg[codec];
new = (old & ~mask) | value;
new = (old & ~mask) | (value & mask);
change = old != new;
if (change) {
mutex_lock(&ac97->reg_mutex);