llc: avoid skb_clone() if there is only one handler

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 12 deletions

diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index f9968743913..058f1e9a912 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -181,25 +181,26 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
          * LLC functionality
          */
         rcv = rcu_dereference(sap->rcv_func);
-        if (rcv) {
-                struct sk_buff *cskb = skb_clone(skb, GFP_ATOMIC);
-                if (cskb)
-                        rcv(cskb, dev, pt, orig_dev);
-        }
         dest = llc_pdu_type(skb);
-        if (unlikely(!dest || !llc_type_handlers[dest - 1]))
-                goto drop_put;
-        llc_type_handlers[dest - 1](sap, skb);
-out_put:
+        if (unlikely(!dest || !llc_type_handlers[dest - 1])) {
+                if (rcv)
+                        rcv(skb, dev, pt, orig_dev);
+                else
+                        kfree_skb(skb);
+        } else {
+                if (rcv) {
+                        struct sk_buff *cskb = skb_clone(skb, GFP_ATOMIC);
+                        if (cskb)
+                                rcv(cskb, dev, pt, orig_dev);
+                }
+                llc_type_handlers[dest - 1](sap, skb);
+        }
         llc_sap_put(sap);
 out:
         return 0;
 drop:
         kfree_skb(skb);
         goto out;
-drop_put:
-        kfree_skb(skb);
-        goto out_put;
 handle_station:
         if (!llc_station_handler)
                 goto drop;