tun: use tun_sk instead container_of

Using macro tun_sk is more clear and shorter. However tun.c has tun_sk,
but doesn't use it.

Signed-off-by: Vitaliy Gusev <vgusev@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 01e99f2..2834a01 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -849,13 +849,13 @@ static void tun_sock_write_space(struct sock *sk)
        if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                wake_up_interruptible_sync(sk->sk_sleep);
 
-       tun = container_of(sk, struct tun_sock, sk)->tun;
+       tun = tun_sk(sk)->tun;
        kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
 }
 
 static void tun_sock_destruct(struct sock *sk)
 {
-       free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
+       free_netdev(tun_sk(sk)->tun->dev);
 }
 
 static struct proto tun_proto = {
@@ -990,7 +990,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                sk->sk_write_space = tun_sock_write_space;
                sk->sk_sndbuf = INT_MAX;
 
-               container_of(sk, struct tun_sock, sk)->tun = tun;
+               tun_sk(sk)->tun = tun;
 
                security_tun_dev_post_create(sk);