From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Linux Frame Buffer Device Development
<linux-fbdev-devel@lists.sourceforge.net>
Subject: lockdep splat from fbmem (fwd)
Date: Thu, 23 Oct 2008 09:30:47 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.64.0810230930431.7533@anakin> (raw)
---------- 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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reply other threads:[~2008-10-23 7:31 UTC|newest]
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