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Since obj->active_count is only updated upon retirement, if we see an
active object in the batch pool, double check that is still active
before deciding to allocate a new object.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170316132006.7976-3-chris@chris-wilson.co.uk

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>