pd: 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/20210602065345.355274-22-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/paride/pd.c

@@ -879,18 +879,6 @@ static void pd_probe_drive(struct pd_unit *disk)
 {
 	struct gendisk *p;
 
-	p = alloc_disk(1 << PD_BITS);
-	if (!p)
-		return;
-
-	strcpy(p->disk_name, disk->name);
-	p->fops = &pd_fops;
-	p->major = major;
-	p->first_minor = (disk - pd) << PD_BITS;
-	p->events = DISK_EVENT_MEDIA_CHANGE;
-	disk->gd = p;
-	p->private_data = disk;
-
 	memset(&disk->tag_set, 0, sizeof(disk->tag_set));
 	disk->tag_set.ops = &pd_mq_ops;
 	disk->tag_set.cmd_size = sizeof(struct pd_req);
@@ -903,14 +891,21 @@ static void pd_probe_drive(struct pd_unit *disk)
 	if (blk_mq_alloc_tag_set(&disk->tag_set))
 		return;
 
-	p->queue = blk_mq_init_queue(&disk->tag_set);
-	if (IS_ERR(p->queue)) {
+	p = blk_mq_alloc_disk(&disk->tag_set, disk);
+	if (!p) {
 		blk_mq_free_tag_set(&disk->tag_set);
-		p->queue = NULL;
 		return;
 	}
+	disk->gd = p;
+
+	strcpy(p->disk_name, disk->name);
+	p->fops = &pd_fops;
+	p->major = major;
+	p->first_minor = (disk - pd) << PD_BITS;
+	p->minors = 1 << PD_BITS;
+	p->events = DISK_EVENT_MEDIA_CHANGE;
+	p->private_data = disk;
 
-	p->queue->queuedata = disk;
 	blk_queue_max_hw_sectors(p->queue, cluster);
 	blk_queue_bounce_limit(p->queue, BLK_BOUNCE_HIGH);
 
@@ -1019,9 +1014,8 @@ static void __exit pd_exit(void)
 		if (p) {
 			disk->gd = NULL;
 			del_gendisk(p);
-			blk_cleanup_queue(p->queue);
 			blk_mq_free_tag_set(&disk->tag_set);
-			put_disk(p);
+			blk_cleanup_disk(p);
 			pi_release(disk->pi);
 		}
 	}