can: rework skb reserved data handling

Added accessor and skb_reserve helpers for struct can_skb_priv.
Removed pointless skb_headroom() check.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
CC: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 3 deletions

diff --git a/net/can/gw.c b/net/can/gw.c
index acdd4656cc3b..c185fcd5e828 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -381,9 +381,7 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
 
         /* is sending the skb back to the incoming interface not allowed? */
         if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
-            skb_headroom(skb) == sizeof(struct can_skb_priv) &&
-            (((struct can_skb_priv *)(skb->head))->ifindex ==
-             gwj->dst.dev->ifindex))
+            can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex)
                 return;
 
         /*