| commit | 5ed61d3f08d44937859dc537c5362ca293c98b04 | [log] [tgz] |
|---|---|---|
| author | Ming Lei <tom.leiming@gmail.com> | Mon Mar 27 20:06:56 2017 +0800 |
| committer | Jens Axboe <axboe@fb.com> | Wed Mar 29 08:03:42 2017 -0600 |
| tree | 02802c310ece8ac247bb016c5d58555612eea76e | |
| parent | d9d149a39690184f63d74e3425c1e90b1d7e67d6 [diff] |
block: add a read barrier in blk_queue_enter() Without the barrier, reading DEAD flag of .q_usage_counter and reading .mq_freeze_depth may be reordered, then the following wait_event_interruptible() may never return. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Ming Lei <tom.leiming@gmail.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Jens Axboe <axboe@fb.com>