From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andrea Righi <righi.andrea@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrey Borzenkov <arvidjaar@mail.ru>,
Geert Uytterhoeven <geert@linux-m68k.org>,
"Antonino A. Daplas" <adaplas@gmail.com>,
linux-fbdev-devel@lists.sourceforge.net,
linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Dave Jones <davej@redhat.com>,
Harvey Harrison <harvey.harrison@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Stefan Richter <stefanr@s5r6.in-berlin.de>
Subject: Re: [PATCH -mmotm] fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency
Date: Thu, 5 Feb 2009 02:49:25 +0100 [thread overview]
Message-ID: <200902050249.27244.rjw@sisk.pl> (raw)
In-Reply-To: <200902050058.31680.rjw@sisk.pl>
On Thursday 05 February 2009, Rafael J. Wysocki wrote:
> On Wednesday 04 February 2009, Andrea Righi wrote:
> > Fix this circular locking dependencies in the frame buffer console
> > driver pushing down the mutex fb_info->lock.
> >
> > Circular locking dependecies occur calling the blocking
> > fb_notifier_call_chain() with fb_info->lock held. Notifier callbacks can
> > try to acquire mm->mmap_sem, while fb_mmap() acquires the locks in the
> > reverse order mm->mmap_sem => fb_info->lock.
>
> Does this fix a Bugzilla bug? If so, then which one?
Never mind, found it.
Thanks,
Rafael
next prev parent reply other threads:[~2009-02-05 1:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-27 18:37 [2.6.29-rc2] fb_mmap: circular locking dependency on hibernation Andrey Borzenkov
2009-01-29 9:10 ` [Linux-fbdev-devel] " Geert Uytterhoeven
2009-01-29 10:03 ` Andrea Righi
2009-01-30 4:15 ` Andrey Borzenkov
2009-01-30 10:23 ` Andrea Righi
2009-01-31 15:53 ` Andrea Righi
2009-01-31 16:05 ` Andrey Borzenkov
2009-01-31 17:09 ` Andrea Righi
2009-01-31 17:44 ` Geert Uytterhoeven
2009-01-31 18:11 ` Andrea Righi
2009-02-01 7:15 ` Andrey Borzenkov
2009-02-01 22:50 ` Andrea Righi
2009-02-02 17:36 ` Andrey Borzenkov
2009-02-03 10:09 ` Andrea Righi
2009-02-04 8:19 ` Andrey Borzenkov
2009-02-04 21:46 ` [PATCH -mmotm] fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency Andrea Righi
2009-02-04 23:58 ` Rafael J. Wysocki
2009-02-05 1:49 ` Rafael J. Wysocki [this message]
2009-03-22 14:48 ` Andrey Borzenkov
2009-03-22 17:57 ` Rafael J. Wysocki
2009-03-22 21:52 ` Andrew Morton
2009-04-06 18:47 ` commit 66c1ca breaks fbdev mode switching Krzysztof Helt
2009-04-06 21:45 ` Andrea Righi
2009-04-07 9:17 ` Geert Uytterhoeven
2009-04-07 9:54 ` Andrea Righi
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