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| author | Eldad Zack <eldad@fogrefinery.com> | 2012-11-29 02:55:36 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-11-29 11:43:31 +0400 |
| commit | 5dae5fd24071319bb67d3375217d5b0b6d16cb0b (patch) | |
| tree | 7e08d0d824a6d34e27162ed7185648752808c0fc /sound | |
| parent | 9f814105926cbeb003b1684cd5564612bccfe45c (diff) | |
| download | linux-5dae5fd24071319bb67d3375217d5b0b6d16cb0b.tar.xz | |
ALSA: usb-audio: skip UAC2 EFFECT_UNIT
Current code mishandles the case where the device is a UAC2
and the bDescriptorSubtype is a UAC2 Effect Unit (0x07).
It tries to parse it as a Processing Unit (which is similar to two
other UAC1 units with overlapping subtypes), but since the structure
is different (See: 4.7.2.10, 4.7.2.11 in UAC2 standard), the parsing
is done incorrectly and prevents the device from initializing.
For now, just ignore the unit.
Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/mixer.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index b0fc6ae037a2..4eacbe2e2d64 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -723,8 +723,19 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ return 0; } case UAC1_PROCESSING_UNIT: - case UAC1_EXTENSION_UNIT: { + case UAC1_EXTENSION_UNIT: + /* UAC2_PROCESSING_UNIT_V2 */ + /* UAC2_EFFECT_UNIT */ { struct uac_processing_unit_descriptor *d = p1; + + if (state->mixer->protocol == UAC_VERSION_2 && + hdr[2] == UAC2_EFFECT_UNIT) { + /* UAC2/UAC1 unit IDs overlap here in an + * uncompatible way. Ignore this unit for now. + */ + return 0; + } + if (d->bNrInPins) { id = d->baSourceID[0]; break; /* continue to parse */ |