From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 14 Oct 2021 15:03:29 +0100
Subject: [PATCH] block: use bdev_get_queue() in blk-core.c
Git-commit: eab4e02733699cdf76fbe5e542d248c28454b3af
Patch-mainline: v5.16-rc1
References: jsc#PED-1183

Convert bdev->bd_disk->queue to bdev_get_queue(), it's uses a cached
queue pointer and so is faster.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/efc41f880262517c8dc32f932f1b23112f21b255.1634219547.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 block/blk-core.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index f008c38ae967..96ee996c0577 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -472,10 +472,11 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
 
 static inline int bio_queue_enter(struct bio *bio)
 {
-	struct gendisk *disk = bio->bi_bdev->bd_disk;
-	struct request_queue *q = disk->queue;
+	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 
 	while (!blk_try_enter_queue(q, false)) {
+		struct gendisk *disk = bio->bi_bdev->bd_disk;
+
 		if (bio->bi_opf & REQ_NOWAIT) {
 			if (test_bit(GD_DEAD, &disk->state))
 				goto dead;
@@ -800,7 +801,7 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
 static noinline_for_stack bool submit_bio_checks(struct bio *bio)
 {
 	struct block_device *bdev = bio->bi_bdev;
-	struct request_queue *q = bdev->bd_disk->queue;
+	struct request_queue *q = bdev_get_queue(bdev);
 	blk_status_t status = BLK_STS_IOERR;
 	struct blk_plug *plug;
 
@@ -962,7 +963,7 @@ static void __submit_bio_noacct(struct bio *bio)
 	current->bio_list = bio_list_on_stack;
 
 	do {
-		struct request_queue *q = bio->bi_bdev->bd_disk->queue;
+		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 		struct bio_list lower, same;
 
 		/*
@@ -980,7 +981,7 @@ static void __submit_bio_noacct(struct bio *bio)
 		bio_list_init(&lower);
 		bio_list_init(&same);
 		while ((bio = bio_list_pop(&bio_list_on_stack[0])) != NULL)
-			if (q == bio->bi_bdev->bd_disk->queue)
+			if (q == bdev_get_queue(bio->bi_bdev))
 				bio_list_add(&same, bio);
 			else
 				bio_list_add(&lower, bio);
@@ -1062,7 +1063,7 @@ void submit_bio(struct bio *bio)
 
 		if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME))
 			count = queue_logical_block_size(
-					bio->bi_bdev->bd_disk->queue) >> 9;
+					bdev_get_queue(bio->bi_bdev)) >> 9;
 		else
 			count = bio_sectors(bio);
 
-- 
2.35.3