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>
mariux64 · Oct 1, 2008 · 6e50e8a · 6e50e8a
1 parent a57334e
commit 6e50e8a
Showing 1 changed file with 6 additions and 5 deletions.
diff --git 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