1 files changed, 9 insertions, 1 deletions
diff --git a/include/net/datalink.h b/include/net/datalink.h
index deb7ca75db48..6c529a40e00d 100644
--- a/include/net/datalink.h
+++ b/include/net/datalink.h
@@ -1,6 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _NET_INET_DATALINK_H_
 #define _NET_INET_DATALINK_H_
 
+#include <linux/list.h>
+
+struct llc_sap;
+struct net_device;
+struct packet_type;
+struct sk_buff;
+
 struct datalink_proto {
         unsigned char   type[8];
 
@@ -11,7 +19,7 @@ struct datalink_proto {
         int     (*rcvfunc)(struct sk_buff *, struct net_device *,
                                 struct packet_type *, struct net_device *);
 	int     (*request)(struct datalink_proto *, struct sk_buff *,
-                                        unsigned char *);
+			   const unsigned char *);
 	struct list_head node;
 };