tree eac254d7cd5b82bda9cfb4cd8b489c6173b40659
parent 59d13bf5f57ded658c872fa22276f75ab8f12841
author Ming Lei <tom.leiming@gmail.com> 1399741308 +0800
committer Jens Axboe <axboe@fb.com> 1399758102 -0600

blk-mq: bitmap tag: use clear_bit_unlock in bt_clear_tag()

The unlock memory barrier need to order access to req in free
path and clearing tag bit, otherwise either request free path
may see a allocated request, or initialized request in allocate
path might be modified by the ongoing free path.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>