can: omit unneeded skb_clone() calls
The AF_CAN core delivered always cloned sk_buffs to the AF_CAN
protocols, although this was _only_ needed by the can-raw protocol.
With this (additionally documented) change, the AF_CAN core calls the
callback functions of the registered AF_CAN protocols with the original
(uncloned) sk_buff pointer and let's the can-raw protocol do the
skb_clone() itself which omits all unneeded skb_clone() calls for other
AF_CAN protocols.
Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: Urs Thuermann <urs.thuermann@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/can/raw.c b/net/can/raw.c
index 27aab63..0703cba 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -99,13 +99,14 @@
struct raw_sock *ro = raw_sk(sk);
struct sockaddr_can *addr;
- if (!ro->recv_own_msgs) {
- /* check the received tx sock reference */
- if (skb->sk == sk) {
- kfree_skb(skb);
- return;
- }
- }
+ /* check the received tx sock reference */
+ if (!ro->recv_own_msgs && skb->sk == sk)
+ return;
+
+ /* clone the given skb to be able to enqueue it into the rcv queue */
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
/*
* Put the datagram to the queue so that raw_recvmsg() can