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mirror_ubuntu-kernels/include/uapi/linux/usb
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Pawel Moll b531f81b0d ALSA: usb: Fix Processing Unit Descriptor parsers 
Commit 99fc86450c "ALSA: usb-mixer:
parse descriptors with structs" introduced a set of useful parsers
for descriptors. Unfortunately the parses for the Processing Unit
Descriptor came with a very subtle bug...

Functions uac_processing_unit_iProcessing() and
uac_processing_unit_specific() were indexing the baSourceID array
forgetting the fields before the iProcessing and process-specific
descriptors.

The problem was observed with Sound Blaster Extigy mixer,
where nNrModes in Up/Down-mix Processing Unit Descriptor
was accessed at offset 10 of the descriptor (value 0)
instead of offset 15 (value 7). In result the resulting
control had interesting limit values:

Simple mixer control 'Channel Routing Mode Select',0
  Capabilities: volume volume-joined penum
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - -1
  Mono: -1 [100%]

Fixed by starting from the bmControls, which was calculated
correctly, instead of baSourceID.

Now the mentioned control is fine:

Simple mixer control 'Channel Routing Mode Select',0
  Capabilities: volume volume-joined penum
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 6
  Mono: 0 [0%]

Signed-off-by: Pawel Moll <mail@pawelmoll.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-02-21 13:55:12 +01:00
..
audio.h ALSA: usb: Fix Processing Unit Descriptor parsers 2013-02-21 13:55:12 +01:00
cdc.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-11-10 18:32:51 -05:00
ch9.h usb: Using correct way to clear usb3.0 device's remote wakeup feature. 2013-01-24 09:58:18 -08:00
ch11.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
functionfs.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
g_printer.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
gadgetfs.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
Kbuild UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
midi.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
tmc.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00
video.h UAPI: (Scripted) Disintegrate include/linux/usb 2012-10-09 09:49:07 +01:00