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drm/i915: Move assert of page pin vs bind count into i915_vma_unbind

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The read of the page pin count and the bind count are unordered,
presenting races in the assert and it firing off incorrectly. Prevent
this by restricting the assert to the vma bind/unbind routines where we
have local cpu ordering between the two.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161231112012.29263-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-12-31 11:20:09 +00:00
parent f50b79f096
commit 7a5580a2a6
2 changed files with 1 additions and 1 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
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@ -3291,7 +3291,6 @@ __i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
GEM_BUG_ON(!obj->mm.pages);
atomic_dec(&obj->mm.pages_pin_count);
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
}
static inline void

1
drivers/gpu/drm/i915/i915_vma.c
View file

@ -640,6 +640,7 @@ int i915_vma_unbind(struct i915_vma *vma)
* reaped by the shrinker.
*/
i915_gem_object_unpin_pages(obj);
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
destroy:
if (unlikely(i915_vma_is_closed(vma)))