net: Use ip_route_input_noref() in input path

Use ip_route_input_noref() in ip fast path, to avoid two atomic ops per
incoming packet.

Note: loopback is excluded from this optimization in ip_rcv_finish()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 80769f1f9fab..f094b75810db 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -854,7 +854,7 @@ static int arp_process(struct sk_buff *skb)
         }
 
         if (arp->ar_op == htons(ARPOP_REQUEST) &&
-            ip_route_input(skb, tip, sip, 0, dev) == 0) {
+            ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
 
                 rt = skb_rtable(skb);
                 addr_type = rt->rt_type;