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drm/i915: Do not leak pages when freeing userptr objects
sg_alloc_table_from_pages() can build us a table with coalesced ranges which means we need to iterate over pages and not sg table entries when releasing page references. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: "Barbalho, Rafael" <rafael.barbalho@intel.com> Tested-by: Rafael Barbalho <rafael.barbalho@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@vger.kernel.org [danvet: Remove unused local variable sg.] Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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