ALSA: usb-audio: fix detection of vendor-specific device protocol settings
commita2acad8298a42b7be684a32fafaf83332bba9c2b
authorClemens Ladisch <clemens@ladisch.de>
Fri, 3 Sep 2010 08:53:11 +0000 (3 10:53 +0200)
committerTakashi Iwai <tiwai@suse.de>
Fri, 3 Sep 2010 20:36:39 +0000 (3 22:36 +0200)
tree34cddff9b3b8efcc3a60a6e9d0a3e001a714d364
parent7b6717e144de6592e614fd7fc3b914b6bf686a9d
ALSA: usb-audio: fix detection of vendor-specific device protocol settings

The Audio Class v2 support code in 2.6.35 added checks for the
bInterfaceProtocol field.  However, there are devices (usually those
detected by vendor-specific quirks) that do not have one of the
predefined values in this field, which made the driver reject them.

To fix this regression, restore the old behaviour, i.e., assume that
a device with an unknown bInterfaceProtocol field (other than
UAC_VERSION_2) has more or less UAC-v1-compatible descriptors.

[compile warning fixes by tiwai]

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/card.c
sound/usb/clock.c
sound/usb/endpoint.c
sound/usb/format.c
sound/usb/mixer.c
sound/usb/pcm.c