qdisc_lookup
struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
p = qdisc_lookup(dev, TC_H_MAJ(sch->parent));
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
p = qdisc_lookup(dev, TC_H_MAJ(clid));
q = qdisc_lookup(dev, tcm->tcm_handle);
p = qdisc_lookup(dev, TC_H_MAJ(clid));
q = qdisc_lookup(dev, tcm->tcm_handle);
q = qdisc_lookup(dev, tcm->tcm_handle);
q = qdisc_lookup(dev, qid);
if (!qdisc_lookup(dev, autohandle))