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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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