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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 17/30] floppy: use blk_mq_alloc_disk and blk_cleanup_disk
Date: Wed,  2 Jun 2021 09:53:32 +0300
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Use blk_mq_alloc_disk and blk_cleanup_disk to simplify the gendisk and
request_queue allocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/floppy.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 8a9d22207c59..cbed9776f285 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4491,23 +4491,15 @@ static bool floppy_available(int drive)
 static int floppy_alloc_disk(unsigned int drive, unsigned int type)
 {
 	struct gendisk *disk;
-	int err;
-
-	disk = alloc_disk(1);
-	if (!disk)
-		return -ENOMEM;
 
-	disk->queue = blk_mq_init_queue(&tag_sets[drive]);
-	if (IS_ERR(disk->queue)) {
-		err = PTR_ERR(disk->queue);
-		disk->queue = NULL;
-		put_disk(disk);
-		return err;
-	}
+	disk = blk_mq_alloc_disk(&tag_sets[drive], NULL);
+	if (IS_ERR(disk))
+		return PTR_ERR(disk);
 
 	blk_queue_max_hw_sectors(disk->queue, 64);
 	disk->major = FLOPPY_MAJOR;
 	disk->first_minor = TOMINOR(drive) | (type << 2);
+	disk->minors = 1;
 	disk->fops = &floppy_fops;
 	disk->events = DISK_EVENT_MEDIA_CHANGE;
 	if (type)
@@ -4727,10 +4719,8 @@ static int __init do_floppy_init(void)
 		if (!disks[drive][0])
 			break;
 		del_timer_sync(&motor_off_timer[drive]);
-		blk_cleanup_queue(disks[drive][0]->queue);
-		disks[drive][0]->queue = NULL;
+		blk_cleanup_disk(disks[drive][0]);
 		blk_mq_free_tag_set(&tag_sets[drive]);
-		put_disk(disks[drive][0]);
 	}
 	return err;
 }
-- 
2.30.2