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drm/i915: Assert the vma's active tracking is clear before free 

In looking at a use-after-free on Baytrail, it looks like the VMA's
activity tracking is suspect. Add some asserts to catch freeing the VMA
before we have decoupled all of its i915_gem_active trackers.

References: https://bugs.freedesktop.org/show_bug.cgi?id=101511
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170620124321.1108-3-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-06-20 13:43:21 +01:00
parent 760a898d80
commit 7a3bc034ed
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/i915_vma.c
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@ -579,11 +579,17 @@ int __i915_vma_do_pin(struct i915_vma *vma,
static void i915_vma_destroy(struct i915_vma *vma)
{
int i;
GEM_BUG_ON(vma->node.allocated);
GEM_BUG_ON(i915_vma_is_active(vma));
GEM_BUG_ON(!i915_vma_is_closed(vma));
GEM_BUG_ON(vma->fence);
for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
GEM_BUG_ON(i915_gem_active_isset(&vma->last_read[i]));
GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
list_del(&vma->vm_link);
if (!i915_vma_is_ggtt(vma))
i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));
@ -680,9 +686,8 @@ int i915_vma_unbind(struct i915_vma *vma)
__i915_vma_unpin(vma);
if (ret)
return ret;
GEM_BUG_ON(i915_vma_is_active(vma));
}
GEM_BUG_ON(i915_vma_is_active(vma));
if (i915_vma_is_pinned(vma))
return -EBUSY;