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[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: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ralf Baechle 2006-12-07 00:11:33 -08:00 committed by David S. Miller
parent 26db167702
commit e16aa207cc
4 changed files with 6 additions and 6 deletions
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4
net/core/wireless.c
View File

@ -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. * 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 * This make sure wireless_spy_update() "see" that the spy list
* is temporarily disabled. */ * is temporarily disabled. */
wmb(); smp_wmb();
/* Are there are addresses to copy? */ /* Are there are addresses to copy? */
if(wrqu->data.length > 0) { 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 */ /* Make sure above is updated before re-enabling */
wmb(); smp_wmb();
/* Enable addresses */ /* Enable addresses */
spydata->spy_number = wrqu->data.length; spydata->spy_number = wrqu->data.length;

2
net/ipv4/inet_timewait_sock.c
View File

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

4
net/ipv4/tcp_input.c
View File

@ -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 * Change state from SYN-SENT only after copied_seq
* is initialized. */ * is initialized. */
tp->copied_seq = tp->rcv_nxt; tp->copied_seq = tp->rcv_nxt;
mb(); smp_mb();
tcp_set_state(sk, TCP_ESTABLISHED); tcp_set_state(sk, TCP_ESTABLISHED);
security_inet_conn_established(sk, skb); 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: case TCP_SYN_RECV:
if (acceptable) { if (acceptable) {
tp->copied_seq = tp->rcv_nxt; tp->copied_seq = tp->rcv_nxt;
mb(); smp_mb();
tcp_set_state(sk, TCP_ESTABLISHED); tcp_set_state(sk, TCP_ESTABLISHED);
sk->sk_state_change(sk); sk->sk_state_change(sk);

2
net/packet/af_packet.c
View File

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