drm/i915: Clear execbuf's vma backpointer upon release
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 22 Jun 2017 10:47:22 +0000 (11:47 +0100)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Mon, 26 Jun 2017 08:38:43 +0000 (10:38 +0200)
commitbdbbf7d619d1fd2f1fa9eb529b7817e4faf73f5e
treebd779b4e1b02032aa1947a87bb49c109edee21ee
parentb88eb199544bd23b709bd56bb9cae8bd114869b0
drm/i915: Clear execbuf's vma backpointer upon release

commit 2889caa92321 ("drm/i915: Eliminate lots of iterations over the
execobjects array") jiggled around the error handling and replace a test
that we cleaned up properly after ourselves with an assertion. That
assertion failed because in the release function (moments after the
assertion) we were indeed forgetting to mark the vma as cleared. The
consequence was when testing an invalid relocation address, we would try
to release the vma twice (following the couple of attempts to verify the
address) and on the second release notice that the first release was
incomplete.

Testcase: igt/gem_reloc_overflow/invalid-address
Fixes: 2889caa92321 ("drm/i915: Eliminate lots of iterations over the execobjects array")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170622104722.2583-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
(cherry picked from commit 51d05e1b29676a0425749a1533b87e3ad3c6f176)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_gem_execbuffer.c