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blk-mq: don't allow queue entering for a dying queue

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If the queue is going away, don't let new allocs or queueing
happen on it. Go through the normal wait process, and exit with
ENODEV in that case.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2014-06-06 10:22:07 -06:00 committed by Jens Axboe
parent a4391c6465
commit 3b632cf0ea
1 changed files with 4 additions and 2 deletions
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6
block/blk-mq.c
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@ -82,8 +82,10 @@ static int blk_mq_queue_enter(struct request_queue *q)
__percpu_counter_add(&q->mq_usage_counter, 1, 1000000);
smp_wmb();
/* we have problems to freeze the queue if it's initializing */
if (!blk_queue_bypass(q) || !blk_queue_init_done(q))
/* we have problems freezing the queue if it's initializing */
if (!blk_queue_dying(q) &&
(!blk_queue_bypass(q) || !blk_queue_init_done(q)))
return 0;
__percpu_counter_add(&q->mq_usage_counter, -1, 1000000);