Radeon: race in dp aux code on atom scratch

[Alex Deucher]

On Mon, Nov 10, 2014 at 2:47 AM, Dave Airlie <airlied at gmail.com> wrote:
> Hey,
>
> I think I spotted a problem in the atombios auxch code, we lock the chan
> mutex, access atom scratch and then call atom execute.
>
> Now atom execute is protected by a mutex, but if multiple aux channels are
> accessed we will collide on the scratch area,
>
> Any ideas on best fix?

Just adding another mutex for the scratch buffer seems like the
easiest solution to me.  How about the attached patch?

Alex

>
> Dave.
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