linux-kernel - Re: [REGRESSION][3.8.-rc1][ INFO: possible circular locking dependency detected ]

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Message-ID: <20121228114525.GD19447@S2101-09.ap.freescale.net>
Date:	Fri, 28 Dec 2012 19:45:26 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Peter Hurley <peter@...leysoftware.com>
CC:	Maciej Rutecki <maciej.rutecki@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [REGRESSION][3.8.-rc1][ INFO: possible circular locking
 dependency detected ]

On Thu, Dec 27, 2012 at 08:03:24AM -0500, Peter Hurley wrote:
> On Thu, 2012-12-27 at 16:36 +0800, Shawn Guo wrote:
> > On Wed, Dec 26, 2012 at 10:34:39AM +0800, Shawn Guo wrote:
> > > It seems that I'm running into the same locking issue.  My setup is:
> > > 
> > > - i.MX28 (ARM)
> > > - v3.8-rc1
> > > - mxs_defconfig
> >   - The warning is seen when LCD is blanking
> > > 
> > 
> > The warning disappears after reverting patch daee779 (console: implement
> > lockdep support for console_lock).  Is it suggesting that the mxs
> > frame buffer driver (drivers/video/mxsfb.c) is doing something bad?
> > 
> > Shawn
> > 
> > > 
> > > [  602.229899] ======================================================
> > > [  602.229905] [ INFO: possible circular locking dependency detected ]
> > > [  602.229926] 3.8.0-rc1-00003-gde4ae7f #767 Not tainted
> > > [  602.229933] -------------------------------------------------------
> > > [  602.229951] kworker/0:1/21 is trying to acquire lock:
> > > [  602.230037]  ((fb_notifier_list).rwsem){.+.+.+}, at: [<c0041f34>] __blocking_notifier_call_chain+0x2c/0x60
> 
> You want this patch https://patchwork.kernel.org/patch/1757061/
> 
Thanks for the pointer, Peter.  It does fix the problem for me.

Shawn

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