linux-kernel - Re: [BUG] drivers/video/sis: deadlock introduced by "fbdev: add mutex for fb

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Date:	Sun, 5 Jul 2009 07:19:33 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Wu Zhangjin <wuzhangjin@...il.com>
cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, Krzysztof Helt <krzysztof.h1@...pl>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	晏华 <yanh@...ote.com>,
	zhangfx <zhangfx@...ote.com>
Subject: Re: [BUG] drivers/video/sis: deadlock introduced by "fbdev: add
 mutex for fb_mmap locking"



On Sun, 5 Jul 2009, Wu Zhangjin wrote:
> 
> then it works! so, I guess there is a deadlock introduced by the above
> commit.

Hmm. Perhaps more likely, the 'mm_lock' mutex hasn't even been initialized 
yet.  We appear to have had that problem with matroxfb and sm501fb, and it 
may be more common than that. See commit f50bf2b2.

That said, I do agree that the mm_lock seems to be causing more problems 
than it actually fixes, and maybe we should revert it. Krzysztof?

		Linus
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