--- zzzz-none-000/linux-4.4.60/drivers/usb/gadget/function/f_sourcesink.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/drivers/usb/gadget/function/f_sourcesink.c	2021-02-04 17:41:59.000000000 +0000
@@ -303,12 +303,6 @@
 	return alloc_ep_req(ep, len, ss->buflen);
 }
 
-void free_ep_req(struct usb_ep *ep, struct usb_request *req)
-{
-	kfree(req->buf);
-	usb_ep_free_request(ep, req);
-}
-
 static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
 {
 	int			value;