> /**
> - * add_disk - add partitioning information to kernel list
> + * device_add_disk - add partitioning information to kernel list
> + * @parent: parent device for the disk
> * @disk: per-device partitioning information
> *
> * This function registers the partitioning information in @disk
> @@ -581,7 +582,7 @@ exit:
> *
> * FIXME: error handling
> */
> -void add_disk(struct gendisk *disk)
> +int device_add_disk(struct device *parent, struct gendisk *disk)
> {
> struct backing_dev_info *bdi;
> dev_t devt;
> @@ -597,10 +598,8 @@ void add_disk(struct gendisk *disk)
> disk->flags |= GENHD_FL_UP;
>
> retval = blk_alloc_devt(&disk->part0, &devt);
> - if (retval) {
> - WARN_ON(1);
> - return;
> - }
> + if (retval)
> + return retval;
> disk_to_dev(disk)->devt = devt;
>
> /* ->major and ->first_minor aren't supposed to be
> @@ -617,7 +616,7 @@ void add_disk(struct gendisk *disk)
>
> blk_register_region(disk_devt(disk), disk->minors, NULL,
> exact_match, exact_lock, disk);
> - register_disk(disk);
> + register_disk(parent, disk);
> blk_register_queue(disk);
>
> /*
> @@ -628,12 +627,11 @@ void add_disk(struct gendisk *disk)
>
> retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
> "bdi");
> - WARN_ON(retval);
> -
> disk_add_events(disk);
> blk_integrity_add(disk);
> + return retval;
How are the callers expected to unwind after already having added the
disk?
