linux-kernel - Re: backlight: oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/* in 2.6.18

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Date:	Fri, 22 Sep 2006 16:02:55 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Olaf Hering <olaf@...fle.de>
Cc:	Michael Hanselmann <linux-kernel@...smi.ch>,
	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net,
	"Antonino A. Daplas" <adaplas@....net>,
	Daniel R Thompson <daniel.thompson@...com>,
	Jon Smirl <jonsmirl@...il.com>
Subject: Re: backlight: oops in __mutex_lock_slowpath during head
 /sys/class/graphics/fb0/* in 2.6.18

On Fri, 22 Sep 2006 13:26:22 +0200
Olaf Hering <olaf@...fle.de> wrote:

> On Thu, Sep 21, Michael Hanselmann wrote:
> 
> > What about the patch below? Does it work for you?
> 
> Appears to work.
> 
> tangerine:~ # head /sys/class/graphics/fb0/*
> ==> /sys/class/graphics/fb0/bits_per_pixel <==
> 8
> 
> ==> /sys/class/graphics/fb0/bl_curve <==
> head: error reading `/sys/class/graphics/fb0/bl_curve': No such device
> 
> ==> /sys/class/graphics/fb0/blank <==
> 
> ==> /sys/class/graphics/fb0/console <==
> 
> ==> /sys/class/graphics/fb0/cursor <==
> 
> ==> /sys/class/graphics/fb0/dev <==
> 29:0
> 
> ==> /sys/class/graphics/fb0/mode <==
> 
> ==> /sys/class/graphics/fb0/modes <==
> U:832x624p-74
> 
> ==> /sys/class/graphics/fb0/name <==
> valkyrie
> 
> ==> /sys/class/graphics/fb0/pan <==
> 0,0
> 
> ==> /sys/class/graphics/fb0/rotate <==
> 0
> 
> ==> /sys/class/graphics/fb0/state <==
> 0
> 
> ==> /sys/class/graphics/fb0/stride <==
> 832
> 
> ==> /sys/class/graphics/fb0/subsystem <==
> head: error reading `/sys/class/graphics/fb0/subsystem': Is a directory
> head: cannot open `/sys/class/graphics/fb0/uevent' for reading: Permission denied
> 
> ==> /sys/class/graphics/fb0/virtual_size <==
> 832,624

Still looks like a bit of a mess, but I assume that's expected.

Michael, I take it that patch was final?
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