[PATCH 4.2 040/134] ALSA: usb-audio: correct the value cache check.

Greg Kroah-Hartman
2015-09-26T20:59:26Z

From: Yao-Wen Mao <yaowen@google.com>

commit 6aa6925cad06159dc6e25857991bbc4960821242 upstream.

The check of cval->cached should be zero-based (including master channel).

Signed-off-by: Yao-Wen Mao <yaowen@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/usb/mixer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2522,7 +2522,7 @@ static int restore_mixer_value(struct us
for (c = 0; c < MAX_CHANNELS; c++) {
if (!(cval->cmask & (1 << c)))
continue;
- if (cval->cached & (1 << c)) {
+ if (cval->cached & (1 << (c + 1))) {
err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
cval->cache_val[idx]);
if (err < 0)