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block: don't call ioc_exit_icq() with the queue lock held for blk-mq

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For legacy scheduling, we always call ioc_exit_icq() with both the
ioc and queue lock held. This poses a problem for blk-mq with
scheduling, since the queue lock isn't what we use in the scheduler.
And since we don't need the queue lock held for ioc exit there,
don't grab it and leave any extra locking up to the blk-mq scheduler.

Reported-by: Paolo Valente <[email protected]>
Tested-by: Paolo Valente <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2017-03-02 13:59:08 -07:00
commit 7b36a7189f
3 changed files with 31 additions and 17 deletions
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2
block/blk-sysfs.c
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@ -815,9 +815,7 @@ static void blk_release_queue(struct kobject *kobj)
blkcg_exit_queue(q);
if (q->elevator) {
spin_lock_irq(q->queue_lock);
ioc_clear_queue(q);
spin_unlock_irq(q->queue_lock);
elevator_exit(q->elevator);
}