linux-kernel - Re: [PATCH] kernfs: Move faulting copy_user operations outside of the mutex

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Date:	Thu, 31 Mar 2016 20:30:05 +0300
From:	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:	Tejun Heo <tj@...nel.org>, Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...el.com>
Cc:	intel-gfx@...ts.freedesktop.org,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernfs: Move faulting copy_user operations outside of
 the mutex

On to, 2016-03-31 at 12:49 -0400, Tejun Heo wrote:
> On Thu, Mar 31, 2016 at 11:45:06AM +0100, Chris Wilson wrote:
> > 
> > A fault in a user provided buffer may lead anywhere, and lockdep warns
> > that we have a potential deadlock between the mm->mmap_sem and the
> > kernfs file mutex:
> ...
> > 
> > Reported-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94350
> > Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> > Reviewed-by: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> > Cc: Tejun Heo <tj@...nel.org>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: NeilBrown <neilb@...e.de>
> > Cc: linux-kernel@...r.kernel.org
> Acked-by: Tejun Heo <tj@...nel.org>
> 

Thanks.

I have applied this locally to our repo to be included into our CI
builds.

We will drop the local patch once this waterfalls from upstream to our
drm-intel-nightly repo.

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation