1 files changed, 6 insertions, 5 deletions

diff --git a/include/linux/if_phonet.h b/include/linux/if_phonet.h
index 7e989216ec17..d70034bcec05 100644
--- a/include/linux/if_phonet.h
+++ b/include/linux/if_phonet.h
@@ -5,14 +5,15 @@
  *
  * Copyright (C) 2008 Nokia Corporation. All rights reserved.
  */
+#ifndef LINUX_IF_PHONET_H
+#define LINUX_IF_PHONET_H
 
-#define PHONET_HEADER_LEN       8       /* Phonet header length */
-
-#define PHONET_MIN_MTU          6
-/* 6 bytes header + 65535 bytes payload */
-#define PHONET_MAX_MTU          65541
+#define PHONET_MIN_MTU          6       /* pn_length = 0 */
+#define PHONET_MAX_MTU          65541   /* pn_length = 0xffff */
 #define PHONET_DEV_MTU          PHONET_MAX_MTU
 
 #ifdef __KERNEL__
 extern struct header_ops phonet_header_ops;
 #endif
+
+#endif