linux-kernel - Re: [DRM] BUG: sleeping function called from invalid context, drm

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Date:	Wed, 11 Aug 2010 18:50:45 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Luca Tettamanti <kronos.it@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sourceforge.net
Subject: Re: [DRM] BUG: sleeping function called from invalid context, drm_lastclose

On Wed, Aug 11, 2010 at 6:48 PM, Luca Tettamanti <kronos.it@...il.com> wrote:
> Hi Arnd,
> this commit:
>
> commit 58374713c9dfb4d231f8c56cac089f6fbdedc2ec
> Author: Arnd Bergmann <arnd@...db.de>
> Date:   Sat Jul 10 23:51:39 2010 +0200
>
>    drm: kill BKL from common code
>
>
> moved the call to (inside drm_release) drm_lastclose inside dev->count_lock
> spinlock.
> drm_lastclose however takes dev->struct_mutex (now inside an atomic
> context):

I have a patch from Chris Wilson that I need to push to fix this,
basically reducing the spin lock coverage,
and relying on the global mutex to handle the open race.

Dave.

>
> BUG: sleeping function called from invalid context at /home/kronos/src/linux-2.6.git/kernel/mutex.c:94
> in_atomic(): 1, irqs_disabled(): 0, pid: 3331, name: Xorg
> Pid: 3331, comm: Xorg Not tainted 2.6.35-06113-gf6cec0a #272
> Call Trace:
>  [<ffffffff8102770e>] __might_sleep+0xf8/0xfa
>  [<ffffffff8127cf18>] mutex_lock+0x1f/0x3e
>  [<ffffffffa052d1c1>] drm_lastclose+0x92/0x2ad [drm]
>  [<ffffffffa052dbc7>] drm_release+0x5ca/0x60d [drm]
>  [<ffffffff810b118f>] fput+0x130/0x1f7
>  [<ffffffff810ae77d>] filp_close+0x63/0x6d
>  [<ffffffff810ae82f>] sys_close+0xa8/0xe2
>  [<ffffffff8100296b>] system_call_fastpath+0x16/0x1b
>
>
> Luca
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