sx8: use blk_mq_alloc_disk and blk_cleanup_disk

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>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210602065345.355274-25-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/sx8.c

@@ -1343,32 +1343,25 @@ static int carm_init_disk(struct carm_host *host, unsigned int port_no)
 {
 	struct carm_port *port = &host->port[port_no];
 	struct gendisk *disk;
-	struct request_queue *q;
 
 	port->host = host;
 	port->port_no = port_no;
 
-	disk = alloc_disk(CARM_MINORS_PER_MAJOR);
-	if (!disk)
-		return -ENOMEM;
+	disk = blk_mq_alloc_disk(&host->tag_set, port);
+	if (IS_ERR(disk))
+		return PTR_ERR(disk);
 
 	port->disk = disk;
 	sprintf(disk->disk_name, DRV_NAME "/%u",
 		(unsigned int)host->id * CARM_MAX_PORTS + port_no);
 	disk->major = host->major;
 	disk->first_minor = port_no * CARM_MINORS_PER_MAJOR;
+	disk->minors = CARM_MINORS_PER_MAJOR;
 	disk->fops = &carm_bd_ops;
 	disk->private_data = port;
 
-	q = blk_mq_init_queue(&host->tag_set);
-	if (IS_ERR(q))
-		return PTR_ERR(q);
-
-	blk_queue_max_segments(q, CARM_MAX_REQ_SG);
-	blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
-
-	q->queuedata = port;
-	disk->queue = q;
+	blk_queue_max_segments(disk->queue, CARM_MAX_REQ_SG);
+	blk_queue_segment_boundary(disk->queue, CARM_SG_BOUNDARY);
 	return 0;
 }
 
@@ -1382,9 +1375,7 @@ static void carm_free_disk(struct carm_host *host, unsigned int port_no)
 
 	if (disk->flags & GENHD_FL_UP)
 		del_gendisk(disk);
-	if (disk->queue)
-		blk_cleanup_queue(disk->queue);
-	put_disk(disk);
+	blk_cleanup_disk(disk);
 }
 
 static int carm_init_shm(struct carm_host *host)