tree 84e1ced842d9e172cb9854ec1f9cd133156d59d4
parent 13cf550448b58abf8f44f5d6a560f2d20871c965
author Ville Syrjälä <ville.syrjala@linux.intel.com> 1403118288 +0300
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1404746516 +0200

drm/i915: Unpin last_context at reset

We're forgetting to unpin the last_context from the ggtt at GPU reset
time. This leads to the vma pin_count leaking at every reset if the
last context wasn't the ring default context. Further use of the same
context will trigger the pin_count check in i915_gem_object_pin() and
userspace will be faced with EBUSY as a result.

This plaques kms_flip rather badly since it performs lots of resets,
and every fd has its own default context these days.

Fix the problem by properly unpinning the last context at reset.

This regression seems to back to

commit acce9ffa4807027965ebd948456fa8385bbee32e
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Fri Dec 6 14:11:03 2013 -0800

   drm/i915: Better reset handling for contexts

Testcase: igt/gem_ctx_exec/reset-pin-leak
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>