Commit 60f2df8a authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

blk-mq: bitmap tag: remove barrier in bt_clear_tag() 



The barrier isn't necessary because both atomic_dec_and_test()
and wake_up() implicate one barrier.

Signed-off-by: default avatarMing Lei <tom.leiming@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 0289b2e1

block/blk-mq-tag.c

+0 −1
Original line number Diff line number Diff line
@@ -244,7 +244,6 @@ static void bt_clear_tag(struct blk_mq_bitmap_tags *bt, unsigned int tag) 


	bs = bt_wake_ptr(bt);

	if (bs && atomic_dec_and_test(&bs->wait_cnt)) {

		smp_mb__after_clear_bit();

		atomic_set(&bs->wait_cnt, bt->wake_cnt);

		bt_index_inc(&bt->wake_index);

		wake_up(&bs->wait);