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ALSA: usb-audio: fix control messages for USB_RECIP_INTERFACE

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Control messages directed to an interface must have the interface number
set in the lower 8 bits of wIndex. This wasn't done correctly for some
clock and mixer messages.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Reported-by: Alex Lee <alexlee188@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack
2010-06-11 17:34:20 +02:00
committed by Takashi Iwai
parent d07140ba7f
commit 11bcbc443a
3 changed files with 16 additions and 6 deletions
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4
sound/usb/helper.h
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@@ -28,5 +28,9 @@ unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
#define snd_usb_get_speed(dev) ((dev)->speed)
#endif
static inline int snd_usb_ctrl_intf(struct snd_usb_audio *chip)
{
return get_iface_desc(chip->ctrl_intf)->bInterfaceNumber;
}
#endif /* __USBAUDIO_HELPER_H */