On Tue, Mar 19, 2013 at 06:08:15PM +0100, Takashi Iwai wrote:
At Tue, 19 Mar 2013 17:12:14 +0100, Torstein Hegge wrote:
UAC2_EXTENSION_UNIT_V2 differs from UAC1_EXTENSION_UNIT, but can be handled in the same way when parsing the unit. Otherwise parse_audio_unit() fails when it sees an extension unit on a UAC2 device.
UAC2_EXTENSION_UNIT_V2 is outside the range allocated by UAC1.
Signed-off-by: Torstein Hegge hegge@resisty.net
Does this bug hit on any existing device with 3.9-rc kernel? If it does, it'd be nice to have a bit actual description.
The bug was reported on a Focusrite Scarlett 8i6 USB with a 3.5.0 kernel [1], where the unhandled subtype causes the card creation to fail:
[ 1144.857836] usb 2-1.2: new high-speed USB device number 4 using ehci_hcd [ 1144.951520] usb 2-1.2: New USB device found, idVendor=1235, idProduct=8002 [ 1144.951531] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1144.951538] usb 2-1.2: Product: Scarlett 8i6 USB [ 1144.951543] usb 2-1.2: Manufacturer: Focusrite [ 1144.951547] usb 2-1.2: SerialNumber: 00006B8B [ 1144.956590] usbaudio: unit 51: unexpected type 0x09 [ 1144.956640] snd-usb-audio: probe of 2-1.2:1.0 failed with error -5
Still waiting for him to report back with a 3.9-rc kernel.
[1] http://thread.gmane.org/gmane.linux.alsa.user/37289/focus=37294
Torstein
sound/usb/mixer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 638e7f7..8eb84c0 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -725,7 +725,8 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ case UAC1_PROCESSING_UNIT: case UAC1_EXTENSION_UNIT: /* UAC2_PROCESSING_UNIT_V2 */
/* UAC2_EFFECT_UNIT */ {
/* UAC2_EFFECT_UNIT */case UAC2_EXTENSION_UNIT_V2: { struct uac_processing_unit_descriptor *d = p1; if (state->mixer->protocol == UAC_VERSION_2 &&@@ -2052,6 +2053,8 @@ static int parse_audio_unit(struct mixer_build *state, int unitid) return parse_audio_extension_unit(state, unitid, p1); else /* UAC_VERSION_2 */ return parse_audio_processing_unit(state, unitid, p1);
- case UAC2_EXTENSION_UNIT_V2:
return parse_audio_extension_unit(state, unitid, p1);-- 1.7.10.4