[alsa-devel] [PATCH] ALSA: usb-audio: Fix parsing descriptor of UAC2 processing unit

[Takashi Iwai]

On Mon, 19 Mar 2018 08:47:49 +0100,
Takashi Iwai wrote:
> 
> On Mon, 19 Mar 2018 08:40:19 +0100,
> Greg Kroah-Hartman wrote:
> > 
> > On Mon, Mar 19, 2018 at 07:11:08AM +0100, Kirill Marinushkin wrote:
> > > Currently, the offsets in the UAC2 processing unit descriptor are
> > > calculated incorrectly. It causes an issue when connecting the device which
> > > provides such a feature:
> > > 
> > > ~~~~
> > > [84126.724420] usb 1-1.3.1: invalid Processing Unit descriptor (id 18)
> > > ~~~~
> > > 
> > > After this patch is applied, the UAC2 processing unit inits w/o this error.
> > > 
> > > Fixes: 5e1ddb481776 ("UAPI: (Scripted) Disintegrate include/linux/usb")
> > > Signed-off-by: Kirill Marinushkin <k.marinushkin at gmail.com>
> > > Cc: Mark Brown <broonie at kernel.org>
> > > Cc: Jaroslav Kysela <perex at perex.cz>
> > > Cc: Takashi Iwai <tiwai at suse.com>
> > > Cc: Thomas Gleixner <tglx at linutronix.de>
> > > Cc: Felipe Balbi <felipe.balbi at linux.intel.com>
> > > Cc: Philippe Ombredanne <pombredanne at nexb.com>
> > > Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> > > Cc: Ruslan Bilovol <ruslan.bilovol at gmail.com>
> > > Cc: linux-kernel at vger.kernel.org
> > > Cc: alsa-devel at alsa-project.org
> > > ---
> > >  include/uapi/linux/usb/audio.h | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > 	Cc: stable <stable at vger.kernel.org>
> >  perhaps?
> 
> Yes, it deserves.  But I'd need to double-check the UAC2
> specification.  It's interesting that such a basic thing hasn't hit
> until now.  Maybe just because it's a fairly minor feature.

... and the patch looks correct, after confirming the UAC2 spec.
Now I applied it, with a minor correction of Fixes tag, which actually
was introduced by 23caaf19b11e ("ALSA: usb-mixer: Add support for
Audio Class v2.0"), and adding Cc to stable.

Thanks!


Takashi