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>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index c10036e7a463..89cb047ab314 100644
--- 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);