WL1271_EXTRA_SPACE_TKIP
memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
extra = WL1271_EXTRA_SPACE_TKIP;
wl->hw->extra_tx_headroom += WL1271_EXTRA_SPACE_TKIP;
memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
extra = WL1271_EXTRA_SPACE_TKIP;
memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);