From 53804236c1a0995e37b97b8e2c1e131aa3da0ca1 Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@ladisch.de>
Date: Wed, 3 Jun 2015 11:36:51 +0200
Subject: [PATCH] ALSA: usb-audio: fix missing input volume controls in MAYA44
USB(+)
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@gmail.com>
Tested-by: nightmixes <nightmixes@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.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 c60103306b18..4f51876cb742 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;
--
2.30.9