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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>
This commit is contained in:
Changli Gao 2011-02-22 01:55:18 +00:00 committed by David S. Miller
parent 9850767201
commit 696ea472e1
1 changed files with 13 additions and 12 deletions
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25
net/llc/llc_input.c
View File

@ -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;