net: fec: fec_enet_rx_queue(): replace manual VLAN header calculation with skb_vlan_eth_hdr()

For better readability and maintainability, use the provided helper function
skb_vlan_eth_hdr() to replace manual the VLAN header calculation, and change
the type of vlan_header to struct vlan_ethhdr to take into account that the
Ethernet header plus VLAN header is returned.

Reviewed-by: Frank Li <[email protected]>
Reviewed-by: Wei Fang <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>
Signed-off-by: NipaLocal <nipa@local>

Author: marckleinebudde

drivers/net/ethernet/freescale/fec_main.c

@@ -1859,8 +1859,7 @@ fec_enet_rx_queue(struct net_device *ndev, u16 queue_id, int budget)
 		    fep->bufdesc_ex &&
 		    (ebdp->cbd_esc & cpu_to_fec32(BD_ENET_RX_VLAN))) {
 			/* Push and remove the vlan tag */
-			struct vlan_hdr *vlan_header =
-					(struct vlan_hdr *) (data + ETH_HLEN);
+			struct vlan_ethhdr *vlan_header = skb_vlan_eth_hdr(skb);
 			vlan_tag = ntohs(vlan_header->h_vlan_TCI);
 
 			vlan_packet_rcvd = true;