[NET]: Memory barrier cleanups

I believe all the below memory barriers only matter on SMP so
therefore the smp_* variant of the barrier should be used.

I'm wondering if the barrier in net/ipv4/inet_timewait_sock.c should be
dropped entirely.  schedule_work's implementation currently implies a
memory barrier and I think sane semantics of schedule_work() should imply
a memory barrier, as needed so the caller shouldn't have to worry.
It's not quite obvious why the barrier in net/packet/af_packet.c is
needed; maybe it should be implied through flush_dcache_page?
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/wireless.c

@@ -2130,7 +2130,7 @@ int iw_handler_set_spy(struct net_device *	dev,
 	 * The rtnl_lock() make sure we don't race with the other iw_handlers.
 	 * This make sure wireless_spy_update() "see" that the spy list
 	 * is temporarily disabled. */
-	wmb();
+	smp_wmb();
 
 	/* Are there are addresses to copy? */
 	if(wrqu->data.length > 0) {
@@ -2159,7 +2159,7 @@ int iw_handler_set_spy(struct net_device *	dev,
 	}
 
 	/* Make sure above is updated before re-enabling */
-	wmb();
+	smp_wmb();
 
 	/* Enable addresses */
 	spydata->spy_number = wrqu->data.length;

net/ipv4/inet_timewait_sock.c

@@ -178,7 +178,7 @@ void inet_twdr_hangman(unsigned long data)
 	need_timer = 0;
 	if (inet_twdr_do_twkill_work(twdr, twdr->slot)) {
 		twdr->thread_slots |= (1 << twdr->slot);
-		mb();
+		smp_mb();
 		schedule_work(&twdr->twkill_work);
 		need_timer = 1;
 	} else {

net/ipv4/tcp_input.c

@@ -4235,7 +4235,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 		 * Change state from SYN-SENT only after copied_seq
 		 * is initialized. */
 		tp->copied_seq = tp->rcv_nxt;
-		mb();
+		smp_mb();
 		tcp_set_state(sk, TCP_ESTABLISHED);
 
 		security_inet_conn_established(sk, skb);
@@ -4483,7 +4483,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 		case TCP_SYN_RECV:
 			if (acceptable) {
 				tp->copied_seq = tp->rcv_nxt;
-				mb();
+				smp_mb();
 				tcp_set_state(sk, TCP_ESTABLISHED);
 				sk->sk_state_change(sk);
 

net/packet/af_packet.c

@@ -660,7 +660,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
 	sll->sll_ifindex = dev->ifindex;
 
 	h->tp_status = status;
-	mb();
+	smp_mb();
 
 	{
 		struct page *p_start, *p_end;