lightnvm: convert to blk_alloc_disk/blk_cleanup_disk

Convert the lightnvm driver to use the blk_alloc_disk and blk_cleanup_disk
helpers to simplify gendisk and request_queue allocation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210521055116.1053587-12-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/core.c

@@ -305,7 +305,6 @@ static int __nvm_config_extended(struct nvm_dev *dev,
 static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 {
 	struct nvm_ioctl_create_extended e;
-	struct request_queue *tqueue;
 	struct gendisk *tdisk;
 	struct nvm_tgt_type *tt;
 	struct nvm_target *t;
@@ -370,23 +369,16 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 		goto err_t;
 	}
 
-	tdisk = alloc_disk(0);
+	tdisk = blk_alloc_disk(dev->q->node);
 	if (!tdisk) {
 		ret = -ENOMEM;
 		goto err_dev;
 	}
 
-	tqueue = blk_alloc_queue(dev->q->node);
-	if (!tqueue) {
-		ret = -ENOMEM;
-		goto err_disk;
-	}
-
 	strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
 	tdisk->major = 0;
 	tdisk->first_minor = 0;
 	tdisk->fops = tt->bops;
-	tdisk->queue = tqueue;
 
 	targetdata = tt->init(tgt_dev, tdisk, create->flags);
 	if (IS_ERR(targetdata)) {
@@ -395,14 +387,14 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 	}
 
 	tdisk->private_data = targetdata;
-	tqueue->queuedata = targetdata;
+	tdisk->queue->queuedata = targetdata;
 
 	mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
 	if (dev->geo.mdts) {
 		mdts = min_t(u32, dev->geo.mdts,
 				(dev->geo.csecs >> 9) * NVM_MAX_VLBA);
 	}
-	blk_queue_max_hw_sectors(tqueue, mdts);
+	blk_queue_max_hw_sectors(tdisk->queue, mdts);
 
 	set_capacity(tdisk, tt->capacity(targetdata));
 	add_disk(tdisk);
@@ -427,10 +419,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 	if (tt->exit)
 		tt->exit(targetdata, true);
 err_init:
-	blk_cleanup_queue(tqueue);
-	tdisk->queue = NULL;
-err_disk:
-	put_disk(tdisk);
+	blk_cleanup_disk(tdisk);
 err_dev:
 	nvm_remove_tgt_dev(tgt_dev, 0);
 err_t:
@@ -444,10 +433,8 @@ static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 {
 	struct nvm_tgt_type *tt = t->type;
 	struct gendisk *tdisk = t->disk;
-	struct request_queue *q = tdisk->queue;
 
 	del_gendisk(tdisk);
-	blk_cleanup_queue(q);
 
 	if (tt->sysfs_exit)
 		tt->sysfs_exit(tdisk);
@@ -456,7 +443,7 @@ static void __nvm_remove_target(struct nvm_target *t, bool graceful)
 		tt->exit(tdisk->private_data, graceful);
 
 	nvm_remove_tgt_dev(t->dev, 1);
-	put_disk(tdisk);
+	blk_cleanup_disk(tdisk);
 	module_put(t->type->owner);
 
 	list_del(&t->list);