fix for crashes provoked by UMS mode

[Alex Deucher]

On Mon, Jan 7, 2013 at 6:21 PM, Ilija Hadzic
<ihadzic at research.bell-labs.com> wrote:
> At Dave's request I ran some regression tests on my CS-refactoring
> patches [1] against old UMS userspace. The tests have revealed
> that the current kernel can be provoked into crashing in UMS mode
> (and the problem is unrelated to refactoring of CS code; it has
> been here before).
>
> The following patches will fix the problem that I discovered
> while testing (and they should probably go to drm-fixes branch).
> First two patches are the fix for the acute problem, while
> the third patch is a fix for an incidental finding uncovered
> while debugging the problem.

I've applied the series to my -fixes tree.

Thanks!

Alex

>
>
> [1] http://lists.freedesktop.org/archives/dri-devel/2013-January/032814.html
>
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