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In the unlikely case the request completes while we regard it as not even executing on the GPU (see the next patch!), we have to flush any pending execution callbacks at retirement and ensure that we do not add any more. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190618074153.16055-4-chris@chris-wilson.co.uk