tree 88f0382840856fc1d58aa12bcbfb2d1ec8eb7ae0
parent 040aefa263aa9cd7bd5df50586c35e1e15e77f84
author Chris Wilson <chris@chris-wilson.co.uk> 1234362404 +0000
committer Eric Anholt <eric@anholt.net> 1236741744 -0700

drm/i915: First recheck for an empty fence register.

If we wait upon a request and successfully unbind a buffer occupying a
fence register, then that slot will be freed and cause a NULL derefrence
upon rescanning.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>