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, 4 insertions, 4 deletions

diff --git a/net/can/bcm.c b/net/can/bcm.c
index ccc27b9e8384..28e12d18f0f1 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -261,8 +261,8 @@ static void bcm_can_tx(struct bcm_op *op)
         if (!skb)
                 goto out;
 
-        skb_reserve(skb, sizeof(struct can_skb_priv));
-        ((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
+        can_skb_reserve(skb);
+        can_skb_prv(skb)->ifindex = dev->ifindex;
 
         memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
 
@@ -1207,7 +1207,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
         if (!skb)
                 return -ENOMEM;
 
-        skb_reserve(skb, sizeof(struct can_skb_priv));
+        can_skb_reserve(skb);
 
         err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
         if (err < 0) {
@@ -1221,7 +1221,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
                 return -ENODEV;
         }
 
-        ((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
+        can_skb_prv(skb)->ifindex = dev->ifindex;
         skb->dev = dev;
         skb->sk  = sk;
         err = can_send(skb, 1); /* send with loopback */