rx50state
if (rx50state.rs_flags & (1 << unit))
rx50state.rs_flags |= 1 << unit;
rx50state.rs_flags &= ~(1 << rx50unit(dev)); /* atomic */
struct rx50state *rs;
rs = &rx50state;
(void) tsleep(&rx50state, PRIBIO, "crxbusy", 0);
struct rx50state *rs = &rx50state;
} rx50state;