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
Date: Thu, 23 Oct 2008 05:23:38 +0200 [thread overview]
Message-ID: <87ljwgj8p1.fsf@saeurebad.de> (raw)
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
next reply other threads:[~2008-10-23 3:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-23 3:23 Johannes Weiner [this message]
2008-10-23 13:10 ` lockdep splat from fbmem Andrea Righi
2008-10-23 13:58 ` lockdep splat from ioctl and mmap fops sharing lock Johannes Weiner
2008-10-23 15:08 ` Stefan Richter
2008-10-23 16:32 ` Johannes Weiner
2008-10-25 9:12 ` Stefan Richter
2008-10-28 22:33 ` lockdep splat from fbmem Andrea Righi
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