ALSA: usb-audio: correct the value cache check.

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>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 6b3acba5da7ac8b1add3dbdb811abc42a2686d85..83d6e76435b4d72fdf1d229072d700fdd242a9e6 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2522,7 +2522,7 @@ 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)