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

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Message-ID: <20130131130206.GB13352@kroah.com>
Date:	Thu, 31 Jan 2013 14:02:06 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Dave Airlie <airlied@...il.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <rmk@....linux.org.uk>,
	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 10:51:27PM +1100, Dave Airlie wrote:
> On Thu, Jan 31, 2013 at 8:21 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > 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.
> 
> I'll ship them via my tree at this point I think, since I now need to
> queue a revert of the revert on top.
> 
> I have a few vgacon/fbcon fixes that I need to go in this cycle.

Ok, I'll gladly let you handle this :)

thanks,

greg k-h
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