block: don't verify IO lock for freeze/unfreeze in elevator_init_mq()

elevator_init_mq() is only called at the entry of add_disk_fwnode() when
disk IO isn't allowed yet.

So not verify io lock(q->io_lockdep_map) for freeze & unfreeze in
elevator_init_mq().

Reported-by: Marek Szyprowski <[email protected]>
Reported-by: Lai Yi <[email protected]>
Fixes: f1be178 ("block: model freeze & enter queue as lock for supporting lockdep")
Signed-off-by: Ming Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Ming Lei

block/elevator.c

@@ -598,13 +598,19 @@ void elevator_init_mq(struct request_queue *q)
 	 * drain any dispatch activities originated from passthrough
 	 * requests, then no need to quiesce queue which may add long boot
 	 * latency, especially when lots of disks are involved.
+	 *
+	 * Disk isn't added yet, so verifying queue lock only manually.
 	 */
-	blk_mq_freeze_queue(q);
+	blk_freeze_queue_start_non_owner(q);
+	blk_freeze_acquire_lock(q, true, false);
+	blk_mq_freeze_queue_wait(q);
+
 	blk_mq_cancel_work_sync(q);
 
 	err = blk_mq_init_sched(q, e);
 
-	blk_mq_unfreeze_queue(q);
+	blk_unfreeze_release_lock(q, true, false);
+	blk_mq_unfreeze_queue_non_owner(q);
 
 	if (err) {
 		pr_warn("\"%s\" elevator initialization failed, "