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| author | Pawel Moll <mail@pawelmoll.com> | 2013-02-21 01:55:50 +0000 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-02-21 13:55:12 +0100 |
| commit | b531f81b0d70ffbe8d70500512483227cc532608 (patch) | |
| tree | 98d91808b595a7160d393c9d4c421f9683cd7eda /arch/tile | |
| parent | 92c69e796b83f922c81a5cf7968cb114a7fa14c6 (diff) | |
| download | linux-b531f81b0d70ffbe8d70500512483227cc532608.tar.gz | |
ALSA: usb: Fix Processing Unit Descriptor parsers
Commit 99fc86450c439039d2ef88d06b222fd51a779176 "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>
Diffstat (limited to 'arch/tile')
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