Comment # 9 on bug 82588 from jospezial

Reverting these two patches did not help. Tested with 3.17.0-rc3 .

Btw, reverting the second patch was not so easy.

radeon_ring.c was splitted up and the patch had to be applied to radeon_ib.c .

the first patch has been reverted here:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/radeon?id=b738ca5d68e4051c86e32f46f67a69f3bb9cee5e