phonet: Protect if_phonet.h against multiple inclusions.
From: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_phonet.h b/include/linux/if_phonet.h
index 7e98921..d70034b 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