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block: wake up all tasks blocked in get_request() 

Once blk_set_queue_dying() is done in blk_cleanup_queue(), we call
blk_freeze_queue() and wait for q->q_usage_counter becoming zero. But
if there are tasks blocked in get_request(), q->q_usage_counter can
never become zero. So we have to wake up all these tasks in
blk_set_queue_dying() first.

Fixes: 3ef28e83ab ("block: generic request_queue reference counting")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2017-11-16 08:08:44 +08:00 committed by Jens Axboe
parent 4358a844fc
commit 34d9715ac1
1 changed files with 2 additions and 2 deletions
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4
block/blk-core.c
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@ -637,8 +637,8 @@ void blk_set_queue_dying(struct request_queue *q)
spin_lock_irq(q->queue_lock);
blk_queue_for_each_rl(rl, q) {
if (rl->rq_pool) {
wake_up(&rl->wait[BLK_RW_SYNC]);
wake_up(&rl->wait[BLK_RW_ASYNC]);
wake_up_all(&rl->wait[BLK_RW_SYNC]);
wake_up_all(&rl->wait[BLK_RW_ASYNC]);
}
}
spin_unlock_irq(q->queue_lock);