QS_RETRY
to->q_state = QS_RETRY;
to->q_state = QS_RETRY;
case QS_RETRY:
#define QS_IS_RETRY(s) ((s) == QS_RETRY)
(s) == QS_RETRY || \
(s) == QS_RETRY)
(s) == QS_RETRY)
(s) == QS_RETRY || \
mci->mci_nextaddr->q_state = QS_RETRY;