can: make struct proto const

can_ioctl is the only reason for struct proto to be non-const.
script/check-patch.pl suggests struct proto be const.

Setting the reference to the common can_ioctl() in all CAN protocols directly
removes the need to make the struct proto writable in af_can.c

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/include/linux/can/core.h b/include/linux/can/core.h
index 6c507bea275f..6f70a6d3a16e 100644
--- a/include/linux/can/core.h
+++ b/include/linux/can/core.h
@@ -36,10 +36,10 @@
  * @prot:       pointer to struct proto structure.
  */
 struct can_proto {
-        int              type;
-        int              protocol;
-        struct proto_ops *ops;
-        struct proto     *prot;
+        int type;
+        int protocol;
+        const struct proto_ops *ops;
+        struct proto *prot;
 };
 
 /* function prototypes for the CAN networklayer core (af_can.c) */
@@ -58,5 +58,6 @@ extern void can_rx_unregister(struct net_device *dev, canid_t can_id,
                               void *data);
 
 extern int can_send(struct sk_buff *skb, int loop);
+extern int can_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 
 #endif /* CAN_CORE_H */