net: sock_diag_handler structs can be const

read only, so change it to const.

Signed-off-by: Shan Wei <[e-mail]>
Acked-by: Pavel Emelyanov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/sock_diag.h

···
 	int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
 };
 
-int sock_diag_register(struct sock_diag_handler *h);
-void sock_diag_unregister(struct sock_diag_handler *h);
+int sock_diag_register(const struct sock_diag_handler *h);
+void sock_diag_unregister(const struct sock_diag_handler *h);
 
 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));
 void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));

net/core/sock_diag.c

···
 #include <linux/inet_diag.h>
 #include <linux/sock_diag.h>
 
-static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
+static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
 static DEFINE_MUTEX(sock_diag_table_mutex);
 
···
 }
 EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
 
-int sock_diag_register(struct sock_diag_handler *hndl)
+int sock_diag_register(const struct sock_diag_handler *hndl)
 {
 	int err = 0;
 
···
 }
 EXPORT_SYMBOL_GPL(sock_diag_register);
 
-void sock_diag_unregister(struct sock_diag_handler *hnld)
+void sock_diag_unregister(const struct sock_diag_handler *hnld)
 {
 	int family = hnld->family;
 
···
 }
 EXPORT_SYMBOL_GPL(sock_diag_unregister);
 
-static inline struct sock_diag_handler *sock_diag_lock_handler(int family)
+static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
 {
 	if (sock_diag_handlers[family] == NULL)
 		request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
···
 	return sock_diag_handlers[family];
 }
 
-static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
+static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
 {
 	mutex_unlock(&sock_diag_table_mutex);
 }
···
 {
 	int err;
 	struct sock_diag_req *req = NLMSG_DATA(nlh);
-	struct sock_diag_handler *hndl;
+	const struct sock_diag_handler *hndl;
 
 	if (nlmsg_len(nlh) < sizeof(*req))
 		return -EINVAL;

net/ipv4/inet_diag.c

···
 	return inet_diag_get_exact(skb, h, (struct inet_diag_req_v2 *)NLMSG_DATA(h));
 }
 
-static struct sock_diag_handler inet_diag_handler = {
+static const struct sock_diag_handler inet_diag_handler = {
 	.family = AF_INET,
 	.dump = inet_diag_handler_dump,
 };
 
-static struct sock_diag_handler inet6_diag_handler = {
+static const struct sock_diag_handler inet6_diag_handler = {
 	.family = AF_INET6,
 	.dump = inet_diag_handler_dump,
 };

net/unix/diag.c

···
 		return unix_diag_get_exact(skb, h, (struct unix_diag_req *)NLMSG_DATA(h));
 }
 
-static struct sock_diag_handler unix_diag_handler = {
+static const struct sock_diag_handler unix_diag_handler = {
 	.family = AF_UNIX,
 	.dump = unix_diag_handler_dump,
 };