On 02.10.2012 09:27, Clemens Ladisch wrote:
> Florian Hanisch wrote:
>>>> usbaudio: unit 2: invalid UAC_FEATURE_UNIT descriptor
>>
>> AudioControl Interface Descriptor:
>> bLength 10
>> bDescriptorType 36
>> bDescriptorSubtype 6 (FEATURE_UNIT)
>> bUnitID 2
>> bSourceID 3
>> bmaControls( 0) 0x0000000c
>> Volume Control (read/write)
>> iFeature 0
>
> This descriptor is perfectly OK; the driver has a bug.
> The following code in parse_audio_feature_unit() in sound/usb/mixer.c
> is valid only for v1 devices; please try to just remove it:
>
> if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
> snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
> return -EINVAL;
> }
Yes, interesting this never got triggered before. The 7 should be a 6 in
v2 case ...
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