af_packet: Use virtio_net_hdr_from_skb() directly.

Remove static function __packet_rcv_vnet(), which only called
virtio_net_hdr_from_skb() and BUG()ged out if an error code was
returned.  Instead, call virtio_net_hdr_from_skb() from the former
call sites of __packet_rcv_vnet() and actually use the error handling
code that is already there.
Signed-off-by: NJarno Rajahalme <jarno@ovn.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/packet/af_packet.c

@@ -1967,15 +1967,6 @@ static unsigned int run_filter(struct sk_buff *skb,
 	return res;
 }
 
-static int __packet_rcv_vnet(const struct sk_buff *skb,
-			     struct virtio_net_hdr *vnet_hdr)
-{
-	if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le()))
-		BUG();
-
-	return 0;
-}
-
 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
 			   size_t *len)
 {
@@ -1985,7 +1976,7 @@ static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
 		return -EINVAL;
 	*len -= sizeof(vnet_hdr);
 
-	if (__packet_rcv_vnet(skb, &vnet_hdr))
+	if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le()))
 		return -EINVAL;
 
 	return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
@@ -2244,8 +2235,9 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
 	spin_unlock(&sk->sk_receive_queue.lock);
 
 	if (po->has_vnet_hdr) {
-		if (__packet_rcv_vnet(skb, h.raw + macoff -
-					   sizeof(struct virtio_net_hdr))) {
+		if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
+					    sizeof(struct virtio_net_hdr),
+					    vio_le())) {
 			spin_lock(&sk->sk_receive_queue.lock);
 			goto drop_n_account;
 		}