Re: [PATCH v2] Scarlett mixer interface inclusion

From: Takashi Iwai <tiwai@suse.de>
To: Chris J Arges <chris.j.arges@canonical.com>
Cc: alsa-devel@alsa-project.org, robin@gareus.org,
	clemens@ladisch.de, th55@gmx.de, david.henningsson@canonical.com
Subject: Re: [PATCH v2] Scarlett mixer interface inclusion
Date: Wed, 05 Nov 2014 15:20:49 +0100	[thread overview]
Message-ID: <s5hbnolu3su.wl-tiwai@suse.de> (raw)
In-Reply-To: <s5hsihxu8hp.wl-tiwai@suse.de>

At Wed, 05 Nov 2014 13:39:30 +0100,
Takashi Iwai wrote:
> 
> At Wed, 05 Nov 2014 12:33:37 +0100,
> Takashi Iwai wrote:
> > 
> > At Wed, 22 Oct 2014 08:36:50 +0200,
> > Takashi Iwai wrote:
> > > 
> > > > 2) When unloading a device there are numerous sysfs_remove_group issues:
> > > > usb 1-1.1: USB disconnect, device number 6
> > > > ------------[ cut here ]------------
> > > > WARNING: CPU: 0 PID: 54 at /build/buildd/linux-3.16.0/fs/sysfs/group.c:219 sysfs_remove_group+0x99/0xa0()
> > > > sysfs group ffffffff82cbd6e0 not found for kobject 'midi1'
> > > (snip)
> > > > However this issue occured even without the patch applied.
> > > 
> > > Yes, there was a similar report, but we couldn't reproduce here.
> > > It's a Oops coming from OSS midi device.  This is fairly harmless, but
> > > annoying.  Could you give your kernel config?  Maybe there's some
> > > difference.
> > 
> > I'm now checking this issue again, and I still couldn't reproduce it
> > on my local machines.  Could you give your kernel config if this still
> > happens?
> > 
> > Also, as a blind shot: does the patch below give any difference?
> 
> Try the one below instead.  This is for 3.18 but should be applicable
> to older kernels, too.  (It's not applicable to for-next branch due to
> the recent cleanups, though.)

The patch was confirmed to fix, at least, for 3.14 kernel:
  https://bugzilla.kernel.org/show_bug.cgi?id=80931

I'll resubmit a proper patch to ML.

Takashi