inet_diag: Add empty bucket optimization to inet_diag too

Skip quickly over empty buckets in inet_diag.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index c10036e..89cb047 100644 (file)
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -782,11 +782,15 @@ skip_listen_ht:
                struct sock *sk;
                struct hlist_node *node;
 
+               num = 0;
+
+               if (hlist_empty(&head->chain) && hlist_empty(&head->twchain))
+                       continue;
+
                if (i > s_i)
                        s_num = 0;
 
                read_lock_bh(lock);
-               num = 0;
                sk_for_each(sk, node, &head->chain) {
                        struct inet_sock *inet = inet_sk(sk);