l2tp: Fix build warning with ipv6 disabled.

net/l2tp/l2tp_core.c: In function ‘l2tp_verify_udp_checksum’:
net/l2tp/l2tp_core.c:499:22: warning: unused variable ‘tunnel’ [-Wunused-variable]

Create a helper "l2tp_tunnel()" to facilitate this, and as a side
effect get rid of a bunch of unnecessary void pointer casts.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 5 deletions

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index aedaa2cd4237..b076e8309bc2 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -115,6 +115,11 @@ struct l2tp_net {
 static void l2tp_session_set_header_len(struct l2tp_session *session, int version);
 static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
 
+static inline struct l2tp_tunnel *l2tp_tunnel(struct sock *sk)
+{
+        return sk->sk_user_data;
+}
+
 static inline struct l2tp_net *l2tp_pernet(struct net *net)
 {
         BUG_ON(!net);
@@ -496,7 +501,6 @@ out:
 static inline int l2tp_verify_udp_checksum(struct sock *sk,
                                            struct sk_buff *skb)
 {
-        struct l2tp_tunnel *tunnel = (struct l2tp_tunnel *)sk->sk_user_data;
         struct udphdr *uh = udp_hdr(skb);
         u16 ulen = ntohs(uh->len);
         __wsum psum;
@@ -505,7 +509,7 @@ static inline int l2tp_verify_udp_checksum(struct sock *sk,
                 return 0;
 
 #if IS_ENABLED(CONFIG_IPV6)
-        if (sk->sk_family == PF_INET6 && !tunnel->v4mapped) {
+        if (sk->sk_family == PF_INET6 && !l2tp_tunnel(sk)->v4mapped) {
                 if (!uh->check) {
                         LIMIT_NETDEBUG(KERN_INFO "L2TP: IPv6: checksum is 0\n");
                         return 1;
@@ -1305,10 +1309,9 @@ EXPORT_SYMBOL_GPL(l2tp_xmit_skb);
  */
 static void l2tp_tunnel_destruct(struct sock *sk)
 {
-        struct l2tp_tunnel *tunnel;
+        struct l2tp_tunnel *tunnel = l2tp_tunnel(sk);
         struct l2tp_net *pn;
 
-        tunnel = sk->sk_user_data;
         if (tunnel == NULL)
                 goto end;
 
@@ -1676,7 +1679,7 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
         }
 
         /* Check if this socket has already been prepped */
-        tunnel = (struct l2tp_tunnel *)sk->sk_user_data;
+        tunnel = l2tp_tunnel(sk);
         if (tunnel != NULL) {
                 /* This socket has already been prepped */
                 err = -EBUSY;