linux-kernel - lockdep splat from fbmem

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Message-ID: <87ljwgj8p1.fsf@saeurebad.de>
Date:	Thu, 23 Oct 2008 05:23:38 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Krzysztof Helt <krzysztof.h1@...pl>
Cc:	Andrea Righi <righi.andrea@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: lockdep splat from fbmem

Hi,

fb_mmap() is called under mmap_sem and acquires fb_info->lock.

Since 3e680aae4e53ab "fb: convert lock/unlock_kernel() into local fb
mutex", fb_ioctl() takes fb_info->lock and does copy_to/from_user()
under it, which in turn might acquire mmap_sem.

Just noticed the trace and wanted to let you know.

        Hannes
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