drm/i915: Count how many VMA are bound for an object
Since we may have VMA allocated for an object, but we interrupted their binding, there is a disparity between have elements on the obj->vma_list and being bound. i915_gem_obj_bound_any() does this check, but this is not rigorously observed - add an explicit count to make it easier. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-7-git-send-email-chris@chris-wilson.co.uk
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