Merge branch 'vmwgfx-fixes-3.19' of git://people.freedesktop.org/~thomash/linux into drm-fixes

fix a vmwgfx regression sleeping wrong task state.

* 'vmwgfx-fixes-3.19' of git://people.freedesktop.org/~thomash/linux:
  drm/vmwgfx: Replace the hw mutex with a hw spinlock