lockdep splat from fbmem (fwd)

lockdep splat from fbmem (fwd)

[Geert Uytterhoeven]

---------- Forwarded message ----------
Date: Thu, 23 Oct 2008 05:23:38 +0200
From: Johannes Weiner <hannes@saeurebad.de>
To: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Andrea Righi <righi.andrea@gmail.com>,
    Linux Kernel Mailing List <linux-kernel@vger.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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