linux-kernel - Re: [PATCH] ALSA: usb-audio: Fix UAC2 get

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Date:   Thu, 8 Feb 2018 07:21:36 +0100
From:   Kirill Marinushkin <k.marinushkin@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     perex@...ex.cz, alsa-devel@...a-project.org,
        Stephen Barber <smbarber@...omium.org>,
        Bhumika Goyal <bhumirks@...il.com>,
        Jaejoong Kim <climbbb.kim@...il.com>,
        Julian Scheel <julian@...st.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Fix UAC2 get_ctl request with a RANGE
 attribute

On 02/07/18 06:45, Takashi Iwai wrote:
> On Mon, 29 Jan 2018 06:37:55 +0100,
> Kirill Marinushkin wrote:
>> The layout of the UAC2 Control request and response varies depending on
>> the request type. With the current implementation, only the Layout 2
>> Parameter Block (with the 2-byte sized RANGE attribute) is handled
>> properly. For the Control requests with the 1-byte sized RANGE attribute
>> (Bass Control, Mid Control, Tremble Control), the response is parsed
>> incorrectly.
>>
>> This commit:
>> * fixes the wLength field value in the request
>> * fixes parsing the range values from the response
>>
>> Fixes: 23caaf19b11e ("ALSA: usb-mixer: Add support for Audio Class v2.0")
>> Signed-off-by: Kirill Marinushkin <k.marinushkin@...il.com>
>> Cc: Jaroslav Kysela <perex@...ex.cz>
>> Cc: Takashi Iwai <tiwai@...e.com>
>> Cc: Jaejoong Kim <climbbb.kim@...il.com>
>> Cc: Bhumika Goyal <bhumirks@...il.com>
>> Cc: Stephen Barber <smbarber@...omium.org>
>> Cc: Julian Scheel <julian@...st.de>
>> Cc: alsa-devel@...a-project.org
>> Cc: linux-kernel@...r.kernel.org
> Sorry for the late reply, as I've been (and still) off.
>
> Does this bug actually hit on any real devices, or is it only a
> logical error so far?  In the former case, a Cc to stable is
> mandatory.
>
> In anyway, I'll review and merge it properly once after I back to
> work.
>
>
> thanks,
>
> Takashi

Hello Takashi,

Thank you for your answer. I will wait until you are back to work, don't 
worry about the late replies.

I did not hit the issue on a real device.

During my UAC2 experiments, I reproduced this issue on the development 
board, and then tested my solution on it.
 
Best Regards,
Kirill