Hello Guys,

The 1st two patches make referring to q->elevator more reliable, and
avoid potential use-after-free on q->elevator in two code paths.

The 3rd patch improves boot time for scsi host with lots of hw queues.

V3:
	- clear QUEUE_FLAG_SQ_SCHED for none & kyber explicitly

V2:
	- follow Christoph's suggestion to set QUEUE_FLAG_SQ_SCHED inside
	mq-deadline and bfq directly


Ming Lei (3):
  blk-mq: protect q->elevator by ->sysfs_lock in blk_mq_elv_switch_none
  blk-mq: avoid to touch q->elevator without any protection
  blk-mq: don't clear flush_rq from tags->rqs[]

 block/bfq-iosched.c    |  3 +++
 block/blk-mq-sched.c   |  1 +
 block/blk-mq.c         | 27 ++++++++-------------------
 block/kyber-iosched.c  |  3 ++-
 block/mq-deadline.c    |  3 +++
 include/linux/blkdev.h |  4 ++--
 6 files changed, 19 insertions(+), 22 deletions(-)

-- 
2.31.1