From e8bb036a46ec4a9d748672f54a6b2d62c82b6fbd Mon Sep 17 00:00:00 2001 From: James C Georgas Date: Thu, 7 Dec 2006 08:10:57 +0100 Subject: [PATCH] [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 Signed-off-by: Jaroslav Kysela --- sound/pci/ac97/ac97_codec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c index 7abcb10b27..91d8ceb4e9 100644 --- a/sound/pci/ac97/ac97_codec.c +++ b/sound/pci/ac97/ac97_codec.c @@ -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); -- 2.39.5