tcp: do not assume TCP code is non preemptible

[deliverable/linux.git] / net / ipv4 / tcp_ipv4.c

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 87b173b563b0ffd0d612200c5f7f6d9bc7828935..761bc492c5e3070212efe91c3940e4712d9d6ef6 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -692,6 +692,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
                     offsetof(struct inet_timewait_sock, tw_bound_dev_if));
 
        arg.tos = ip_hdr(skb)->tos;
+       preempt_disable();
        ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
                              skb, &TCP_SKB_CB(skb)->header.h4.opt,
                              ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
@@ -699,6 +700,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
 
        __TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
        __TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
+       preempt_enable();
 
 #ifdef CONFIG_TCP_MD5SIG
 out:
@@ -774,12 +776,14 @@ static void tcp_v4_send_ack(struct net *net,
        if (oif)
                arg.bound_dev_if = oif;
        arg.tos = tos;
+       preempt_disable();
        ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
                              skb, &TCP_SKB_CB(skb)->header.h4.opt,
                              ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
                              &arg, arg.iov[0].iov_len);
 
        __TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
+       preempt_enable();
 }
 
 static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
@@ -1151,12 +1155,12 @@ static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
                return false;
 
        if (hash_expected && !hash_location) {
-               __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
+               NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
                return true;
        }
 
        if (!hash_expected && hash_location) {
-               __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
+               NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
                return true;
        }
 
@@ -1342,7 +1346,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
        return newsk;
 
 exit_overflow:
-       __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
+       NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 exit_nonewsk:
        dst_release(dst);
 exit:
@@ -1432,8 +1436,8 @@ discard:
        return 0;
 
 csum_err:
-       __TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
-       __TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
+       TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
+       TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
        goto discard;
 }
 EXPORT_SYMBOL(tcp_v4_do_rcv);