[alsa-devel] [PATCH] ALSA: usb: Parse UAC2 extension unit like for UAC1

[Takashi Iwai]

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 at 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.  Then I'm
going to merge this for the next 3.9-rc.  Otherwise it'll go to
for-next branch.


thanks,

Takashi


> ---
>  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);
>  	default:
>  		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
>  		return -EINVAL;
> -- 
> 1.7.10.4
> 
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