[SOCK]: Add some notes about per-bind-bucket sock lookup.

I was asked about "why don't we perform a sk_net filtering in
bind_conflict calls, like we do in other sock lookup places"
for a couple of times.

Can we please add a comment about why we do not need one?

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 78de42ada844..87801cc1b2f8 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -33,6 +33,10 @@ int inet6_csk_bind_conflict(const struct sock *sk,
         const struct hlist_node *node;
 
         /* We must walk the whole port owner list in this case. -DaveM */
+        /*
+         * See comment in inet_csk_bind_conflict about sock lookup
+         * vs net namespaces issues.
+         */
         sk_for_each_bound(sk2, node, &tb->owners) {
                 if (sk != sk2 &&
                     (!sk->sk_bound_dev_if ||