[alsa-devel] [PATCH] ALSA: usb-audio: correct the value cache check.

[Yao-Wen Mao]

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

Signed-off-by: Yao-Wen Mao <yaowen at google.com>
---
 sound/usb/mixer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index fd5c49e..f494dce 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2540,7 +2540,7 @@ static int restore_mixer_value(struct usb_mixer_elem_list *list)
 		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)
-- 
2.5.0.457.gab17608