[PATCH v2 08/19] block, bfq: don't grab queue_lock to initialize bfq

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Request_queue is freezed and quiesced during elevator init_sched()
method, there is no point to hold queue_lock for protection.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 block/bfq-iosched.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 9e0eee9aba5c..86309828e235 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -7203,10 +7203,7 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_queue *eq)
 		return -ENOMEM;
 
 	eq->elevator_data = bfqd;
-
-	spin_lock_irq(&q->queue_lock);
 	q->elevator = eq;
-	spin_unlock_irq(&q->queue_lock);
 
 	/*
 	 * Our fallback bfqq if bfq_find_alloc_queue() runs into OOM issues.
@@ -7239,7 +7236,6 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_queue *eq)
 	 * If the disk supports multiple actuators, copy independent
 	 * access ranges from the request queue structure.
 	 */
-	spin_lock_irq(&q->queue_lock);
 	if (ia_ranges) {
 		/*
 		 * Check if the disk ia_ranges size exceeds the current bfq
@@ -7265,7 +7261,6 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_queue *eq)
 		bfqd->sector[0] = 0;
 		bfqd->nr_sectors[0] = get_capacity(q->disk);
 	}
-	spin_unlock_irq(&q->queue_lock);
 
 	INIT_LIST_HEAD(&bfqd->dispatch);
 
-- 
2.51.0