BSTP_IFSTATE_BLOCKING
if (bif->bif_state == BSTP_IFSTATE_BLOCKING) {
(bif->bif_state != BSTP_IFSTATE_BLOCKING)) {
bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
bstp_set_port_state(bif, BSTP_IFSTATE_BLOCKING);
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_BLOCKING:
case BSTP_IFSTATE_BLOCKING: