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, 2 insertions, 2 deletions

diff --git a/net/can/raw.c b/net/can/raw.c
index 5d860e8dcc52..c1764e41ddaf 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -705,8 +705,8 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
         if (!skb)
                 goto put_dev;
 
-        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;
 
         err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
         if (err < 0)