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authorDaniel Mack <daniel@caiaq.de>2010-05-27 20:15:14 +0200
committerTakashi Iwai <tiwai@suse.de>2010-05-28 07:48:17 +0200
commite8d0fee70b66694959eab10c41788b9279d73629 (patch)
tree3e7e3754298f1e1ccb994149427980f1afb6d052 /sound/usb
parent3ee317fe9cf08d81501b142bf0054c25e3ed5e7d (diff)
downloadlinux-2.6.34-ux500-e8d0fee70b66694959eab10c41788b9279d73629.tar.gz
ALSA: usb-audio: fix feature unit parser for UAC2
Fix a small off-by-one bug which causes the feature unit to announce a wrong number of channels. This leads to illegal requests sent to the firmware eventually. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/mixer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 97dd1765510..03ce971e002 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1126,7 +1126,7 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
} else {
struct uac2_feature_unit_descriptor *ftr = _ftr;
csize = 4;
- channels = (hdr->bLength - 6) / 4;
+ channels = (hdr->bLength - 6) / 4 - 1;
bmaControls = ftr->bmaControls;
}