mtd: ubi: block: wire-up device parent

ubiblock devices were previously only identifyable by their name, but
not connected to their parent UBI volume device e.g. in sysfs.
Properly parent ubiblock device as descendant of a UBI volume device
to reflect device model hierachy.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/block.c

@@ -419,7 +419,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 	list_add_tail(&dev->list, &ubiblock_devices);
 
 	/* Must be the last step: anyone can call file ops from now on */
-	ret = add_disk(dev->gd);
+	ret = device_add_disk(vi->dev, dev->gd, NULL);
 	if (ret)
 		goto out_remove_minor;
 

drivers/mtd/ubi/kapi.c

@@ -79,6 +79,7 @@ void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
 	vi->name_len = vol->name_len;
 	vi->name = vol->name;
 	vi->cdev = vol->cdev.dev;
+	vi->dev = &vol->dev;
 }
 
 /**

include/linux/mtd/ubi.h

@@ -110,6 +110,7 @@ struct ubi_volume_info {
 	int name_len;
 	const char *name;
 	dev_t cdev;
+	struct device *dev;
 };
 
 /**