tree 14a5a0040455fc98136a7cdb6f8ec883d7d118c4
parent 2bfc96a127bc1cc94d26bfaa40159966064f9c8c
author Daniel Mack <daniel@caiaq.de> 1283418795 +0800
committer Takashi Iwai <tiwai@suse.de> 1283421517 +0200

ALSA: usb-audio: Assume first control interface is for audio

For devices with more than one control interface, let's assume the first
one contains the audio controls. Unfortunately, there is no field in any
of the descriptors to tell us whether a control interface is for audio
or MIDI controls, so a better check is not easy to implement.

On a composite device with audio and MIDI functions, for example, the
code currently overwrites chip->ctrl_intf, causing operations on the
control interface to fail if they are issued after the device probe.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>