IEEE802154_FCS_LEN
IEEE802154_FCS_LEN)
IEEE802154_FCS_LEN;
dev->mtu = IEEE802154_MTU - IEEE802154_FCS_LEN -
if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
IEEE802154_FCS_LEN;