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drm/i915: Unpin stolen pages

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The way the stolen handling works is we take a pin on the backing pages,
but we never actually get a reference to the bo. On freeing objects
allocated with stolen memory, the final unref will end up freeing the
object with pinned pages count left. To enable an assertion to catch
bugs in this code path, this patch cleans up that remaining pin.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-05-31 14:46:20 -07:00 committed by Daniel Vetter
parent dd53e1b0ed
commit 1d64ae719b
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/i915_gem.c
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@ -3860,6 +3860,11 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj)
dev_priv->mm.interruptible = was_interruptible;
}
/* Stolen objects don't hold a ref, but do hold pin count. Fix that up
* before progressing. */
if (obj->stolen)
i915_gem_object_unpin_pages(obj);
obj->pages_pin_count = 0;
i915_gem_object_put_pages(obj);
i915_gem_object_free_mmap_offset(obj);