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if one process is terminated by ctrl-c while two processes are using pageflip feature then for last pageflip event, user can't get poll from kernel side so this patch fixes the problem. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyoungmin Park <kyungmin.park@samsung.com>