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authorMing Lei <tom.leiming@gmail.com>2014-05-11 01:01:49 +0800
committerJens Axboe <axboe@fb.com>2014-05-10 15:42:13 -0600
commit60f2df8a29df5f2db2c87fd23122a1cebdf2011a (patch)
tree29357144d3693b6569e6d525873c31c273c9cc56 /block/blk-mq-tag.c
parent0289b2e110b7824b2f76d194ad6f8f0844e270ad (diff)
downloadkernel-60f2df8a29df5f2db2c87fd23122a1cebdf2011a.tar.gz
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: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-tag.c')
-rw-r--r--block/blk-mq-tag.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index a81b138e89fe..5a83d8e587f7 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -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);