[alsa-devel] [PATCH] ALSA: sound/usb: fix UAC1 regression

[Daniel Mack]

Commit 23caaf19b ("ALSA: usb-mixer: Add support for Audio Class v2.0")
broke support for Class1 devices due to two faulty changes. This patch
fixes it.

Signed-off-by: Daniel Mack <daniel at caiaq.de>
Reported-and-Tested-by: The Source <thesourcehim at gmail.com>
Cc: Takashi Iwai <tiwai at suse.de>
Cc: Clemens Ladisch <clemens at ladisch.de>
---
 include/linux/usb/audio.h |    2 +-
 sound/usb/mixer.c         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
index 905a87c..57f2055 100644
--- a/include/linux/usb/audio.h
+++ b/include/linux/usb/audio.h
@@ -244,7 +244,7 @@ struct uac_selector_unit_descriptor {
 static inline __u8 uac_selector_unit_iSelector(struct uac_selector_unit_descriptor *desc)
 {
 	__u8 *raw = (__u8 *) desc;
-	return raw[desc->bLength - 1];
+	return raw[9 + desc->bLength - 1];
 }
 
 /* 4.3.2.5 Feature Unit Descriptor */
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 21613fe..fa0fb77 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -656,7 +656,7 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_
 		case UAC_FEATURE_UNIT: {
 			/* the header is the same for v1 and v2 */
 			struct uac_feature_unit_descriptor *d = p1;
-			id = d->bUnitID;
+			id = d->bSourceID;
 			break; /* continue to parse */
 		}
 		case UAC_MIXER_UNIT: {
-- 
1.7.1