diff -drupN a/include/linux/usb/composite.h b/include/linux/usb/composite.h
--- a/include/linux/usb/composite.h	2018-08-06 17:23:04.000000000 +0300
+++ b/include/linux/usb/composite.h	2022-06-12 05:28:14.000000000 +0300
@@ -584,6 +584,7 @@ struct usb_function_instance {
 	struct config_group group;
 	struct list_head cfs_list;
 	struct usb_function_driver *fd;
+	struct usb_function *f;
 	int (*set_inst_name)(struct usb_function_instance *inst,
 			      const char *name);
 	void (*free_func_inst)(struct usb_function_instance *inst);