When a request completion is polled, the completion task wakes itself up. This is unnecessary, as the task can just set itself back to running. Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx> --- fs/block_dev.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 4a181fcb5175..ce67ffe73430 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -181,7 +181,10 @@ static void blkdev_bio_end_io_simple(struct bio *bio) struct task_struct *waiter = bio->bi_private; WRITE_ONCE(bio->bi_private, NULL); - wake_up_process(waiter); + if (current != waiter) + wake_up_process(waiter); + else + __set_current_state(TASK_RUNNING); } static ssize_t -- 2.13.6
