DSR_nBUSY
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
DSR_nBUSY | DSR_nFAULT)) {
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
if (parport_wait_peripheral(p, DSR_nBUSY | DSR_nFAULT,
DSR_nBUSY | DSR_nFAULT)) {
if (parport_wait_peripheral(p, DSR_nBUSY, DSR_nBUSY))
if (!(dsr & DSR_nBUSY))