__skb_dequeue_tail
while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) {
while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
result = __skb_dequeue_tail(list);
while ((skb = __skb_dequeue_tail(queue)) != NULL)
while ((skb = __skb_dequeue_tail(queue)) != NULL) {
to_drop = __skb_dequeue_tail(lp_qdisc);