Index: uspace/lib/usb/include/usb/usb.h
===================================================================
--- uspace/lib/usb/include/usb/usb.h	(revision a6afb4c8b46f2fd061c625a25b38c08e55f59201)
+++ uspace/lib/usb/include/usb/usb.h	(revision e454d9cbb49d4f6b6fc5e5a5fbe7a39fd632038e)
@@ -152,14 +152,4 @@
 }
 
-static inline bool usb_transfer_type_is_valid(usb_transfer_type_t type)
-{
-	return (type >= 0) && (type < USB_TRANSFER_COUNT);
-}
-
-static inline bool usb_direction_is_valid(usb_direction_t dir)
-{
-	return (dir >= 0) && (dir < USB_DIRECTION_COUNT);
-}
-
 /** USB packet identifier. */
 typedef enum {