[BUG] drm/radeon: locking problems with page_flip

[Michel Dänzer]

On Die, 2011-09-13 at 05:49 +0200, Witold Baryluk wrote: 
> 
> I yeasterday discovered pretty nasty issue in radeon / drm code,
> and page_flip locking code on my ThinkPad T43.

Does the patch below fix the problem?