rbd: assign header name later

Move the assignment of the header name for an rbd image a bit later,
outside rbd_add_parse_args() and into its caller.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

@@ -2474,15 +2474,6 @@ static char *rbd_add_parse_args(struct rbd_device *rbd_dev,
 	if (!rbd_dev->image_name)
 		goto out_err;
 
-	/* Create the name of the header object */
-
-	rbd_dev->header_name = kmalloc(rbd_dev->image_name_len
-						+ sizeof (RBD_SUFFIX),
-					GFP_KERNEL);
-	if (!rbd_dev->header_name)
-		goto out_err;
-	sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX);
-
 	/* Snapshot name is optional */
 	len = next_token(&buf);
 	if (!len) {
@@ -2500,8 +2491,6 @@ dout("    SNAP_NAME is <%s>, len is %zd\n", snap_name, len);
 	return snap_name;
 
 out_err:
-	kfree(rbd_dev->header_name);
-	rbd_dev->header_name = NULL;
 	kfree(rbd_dev->image_name);
 	rbd_dev->image_name = NULL;
 	rbd_dev->image_name_len = 0;
@@ -2566,6 +2555,15 @@ static ssize_t rbd_add(struct bus_type *bus,
 		goto err_out_client;
 	rbd_dev->pool_id = rc;
 
+	/* Create the name of the header object */
+
+	rbd_dev->header_name = kmalloc(rbd_dev->image_name_len
+						+ sizeof (RBD_SUFFIX),
+					GFP_KERNEL);
+	if (!rbd_dev->header_name)
+		goto err_out_client;
+	sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX);
+
 	/* register our block device */
 	rc = register_blkdev(0, rbd_dev->name);
 	if (rc < 0)
@@ -2626,11 +2624,11 @@ static ssize_t rbd_add(struct bus_type *bus,
 err_out_blkdev:
 	unregister_blkdev(rbd_dev->major, rbd_dev->name);
 err_out_client:
+	kfree(rbd_dev->header_name);
 	rbd_put_client(rbd_dev);
 err_put_id:
 	if (rbd_dev->pool_name) {
 		kfree(rbd_dev->mapping.snap_name);
-		kfree(rbd_dev->header_name);
 		kfree(rbd_dev->image_name);
 		kfree(rbd_dev->pool_name);
 	}