linux-kernel - Re: BUG: circular locking dependency detected

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Date:	Thu, 31 Jan 2013 10:21:46 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <rmk@....linux.org.uk>,
	Dave Airlie <airlied@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: BUG: circular locking dependency detected

On Thu, Jan 31, 2013 at 09:21:16AM +0100, Daniel Vetter wrote:
> On Thu, Jan 31, 2013 at 6:40 AM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > On Thu, Jan 31, 2013 at 11:26:53AM +1100, Linus Torvalds wrote:
> >> On Thu, Jan 31, 2013 at 11:13 AM, Russell King <rmk@....linux.org.uk> wrote:
> >> >
> >> > Which may or may not be a good thing depending how you look at it; it
> >> > means that once your kernel blanks, you get a lockdep dump.  At that
> >> > point you lose lockdep checking for everything else because lockdep
> >> > disables itself after the first dump.
> >>
> >> Fair enough, we may want to revert the lockdep checking for
> >> console_lock, and make re-enabling it part of the patch-series that
> >> fixes the locking.
> >>
> >> Daniel/Dave? Does that sound reasonable?
> 
> Yeah, sounds good.
> 
> > Reverting the patch is fine with me.  Just let me know so I can queue it
> > up again for 3.9.
> 
> Can you please also pick up the (currently) three locking fixups
> around fbcon? Just so that we don't repeat the same fun where people
> complain about lockdep splats, but the fixes are stuck somewhere. And
> I guess Dave would be happy to not end up as fbcon maintainer ;-) He
> has a git branch with them at
> http://cgit.freedesktop.org/~airlied/linux/log/?h=fbcon-locking-fixes
> though I have a small bikeshed on his last patch pending.

Care to just send me the patches through email when you all get done
bikesheding?  And for some reason I thought Andrew was going to handle
these fbcon patches, but if not, I'll be glad to take them.

thanks,

greg k-h
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