mac_stop_ring
mac_stop_ring(ring);
mac_stop_ring(ring);
mac_stop_ring(rr_ring);
mac_stop_ring(ring);
mac_stop_ring(ring);
mac_stop_ring(ring);
mac_stop_ring(ring);
mac_stop_ring(ring);
mac_stop_ring(ring);
extern void mac_stop_ring(mac_ring_t *);