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If it is async, runqueue_node is freed in g2d_runqueue_worker on another worker thread. So in extreme cases, if g2d_runqueue_worker runs first, and then executes the following if statement, there will be use-after-free. Signed-off-by: Min Li <lm0963hack@gmail.com> Reviewed-by: Andi Shyti <andi.shyti@kernel.org> Signed-off-by: Inki Dae <inki.dae@samsung.com>