linux-kernel - [PATCH 3.13.y-ckt 36/56] ALSA: usb-audio: fix missing input volume controls in MAYA44 USB(+)

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Message-Id: <1436370037-25874-37-git-send-email-kamal@canonical.com>
Date:	Wed,  8 Jul 2015 08:40:17 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Clemens Ladisch <clemens@...isch.de>, Takashi Iwai <tiwai@...e.de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 36/56] ALSA: usb-audio: fix missing input volume controls in MAYA44 USB(+)

3.13.11-ckt23 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Clemens Ladisch <clemens@...isch.de>

commit ea114fc27dc0cb9a550b6add5426720feb66262a upstream.

The driver worked around an error in the MAYA44 USB(+)'s mixer unit
descriptor by aborting before parsing the missing field.  However,
aborting parsing too early prevented parsing of the other units
connected to this unit, so the capture mixer controls would be missing.

Fix this by moving the check for this descriptor error after the parsing
of the unit's input pins.

Reported-by: nightmixes <nightmixes@...il.com>
Tested-by: nightmixes <nightmixes@...il.com>
Signed-off-by: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 sound/usb/mixer.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index c601033..4f51876 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1514,11 +1514,6 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *r
 		snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
 		return -EINVAL;
 	}
-	/* no bmControls field (e.g. Maya44) -> ignore */
-	if (desc->bLength <= 10 + input_pins) {
-		snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
-		return 0;
-	}
 
 	num_ins = 0;
 	ich = 0;
@@ -1526,6 +1521,9 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *r
 		err = parse_audio_unit(state, desc->baSourceID[pin]);
 		if (err < 0)
 			continue;
+		/* no bmControls field (e.g. Maya44) -> ignore */
+		if (desc->bLength <= 10 + input_pins)
+			continue;
 		err = check_input_term(state, desc->baSourceID[pin], &iterm);
 		if (err < 0)
 			return err;
-- 
1.9.1

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