[drm2][panic] Running XOrg with SNA enabled causes system panic after few hours on G33

[Konstantin Belousov]

On Wed, Jun 19, 2013 at 01:11:19AM +0400, Oleg Sidorkin wrote:
> On Sun, Jun 16, 2013 at 6:27 PM, Konstantin Belousov
> <kostikbel at gmail.com> wrote:
> > On Sun, Jun 16, 2013 at 06:04:39PM +0400, Oleg Sidorkin wrote:
> >> Thanks for the patch.
> >> I've adapted the proposed patch for stable/9 and it is running with
> >> SNA enabled now.
> >
> > In other words, your problem seems to be gone with the patch applied ?
> >
> 
> Now 48h are passed without panics. Fix definitely works. Thanks.

Thank you.

I tested it locally (without SNA) and committed the change a hour ago.
It is required anyway, since the race sounds possible.  I was mostly
concerned with a thinko in the logic.
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