From 6aa6925cad06159dc6e25857991bbc4960821242 Mon Sep 17 00:00:00 2001
From: Yao-Wen Mao <yaowen@google.com>
Date: Fri, 28 Aug 2015 16:33:25 +0800
Subject: ALSA: usb-audio: correct the value cache check.

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

Signed-off-by: Yao-Wen Mao <yaowen@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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)
-- 
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