__QDISC_STATE_SCHED
while (test_bit(__QDISC_STATE_SCHED, &q->state))
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
clear_bit(__QDISC_STATE_SCHED, &q->state);
clear_bit(__QDISC_STATE_SCHED, &q->state);
test_bit(__QDISC_STATE_SCHED, &q->state));