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>

3 files changed, 21 insertions, 21 deletions

diff --git a/net/can/af_can.c b/net/can/af_can.c
index 3dadb338addd..fa417ca6cbe6 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -414,6 +414,12 @@ static struct hlist_head *find_rcv_list(canid_t *can_id, canid_t *mask,
  *  The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
  *  filter for error frames (CAN_ERR_FLAG bit set in mask).
  *
+ *  The provided pointer to the sk_buff is guaranteed to be valid as long as
+ *  the callback function is running. The callback function must *not* free
+ *  the given sk_buff while processing it's task. When the given sk_buff is
+ *  needed after the end of the callback function it must be cloned inside
+ *  the callback function with skb_clone().
+ *
  * Return:
  *  0 on success
  *  -ENOMEM on missing cache mem to create subscription entry
@@ -569,13 +575,8 @@ EXPORT_SYMBOL(can_rx_unregister);
 
 static inline void deliver(struct sk_buff *skb, struct receiver *r)
 {
-        struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
-
-        if (clone) {
-                clone->sk = skb->sk;
-                r->func(clone, r->data);
-                r->matches++;
-        }
+        r->func(skb, r->data);
+        r->matches++;
 }
 
 static int can_rcv_filter(struct dev_rcv_lists *d, struct sk_buff *skb)
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 6248ae2502c7..1649c8ab2c2f 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -633,7 +633,7 @@ static void bcm_rx_handler(struct sk_buff *skb, void *data)
         hrtimer_cancel(&op->timer);
 
         if (op->can_id != rxframe->can_id)
-                goto rx_freeskb;
+                return;
 
         /* save rx timestamp */
         op->rx_stamp = skb->tstamp;
@@ -645,19 +645,19 @@ static void bcm_rx_handler(struct sk_buff *skb, void *data)
         if (op->flags & RX_RTR_FRAME) {
                 /* send reply for RTR-request (placed in op->frames[0]) */
                 bcm_can_tx(op);
-                goto rx_freeskb;
+                return;
         }
 
         if (op->flags & RX_FILTER_ID) {
                 /* the easiest case */
                 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
-                goto rx_freeskb_starttimer;
+                goto rx_starttimer;
         }
 
         if (op->nframes == 1) {
                 /* simple compare with index 0 */
                 bcm_rx_cmp_to_index(op, 0, rxframe);
-                goto rx_freeskb_starttimer;
+                goto rx_starttimer;
         }
 
         if (op->nframes > 1) {
@@ -678,10 +678,8 @@ static void bcm_rx_handler(struct sk_buff *skb, void *data)
                 }
         }
 
-rx_freeskb_starttimer:
+rx_starttimer:
         bcm_rx_starttimer(op);
-rx_freeskb:
-        kfree_skb(skb);
 }
 
 /*
diff --git a/net/can/raw.c b/net/can/raw.c
index 27aab63df467..0703cba4bf9f 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -99,13 +99,14 @@ static void raw_rcv(struct sk_buff *skb, void *data)
         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