ccw_device_do_sense
int ccw_device_do_sense(struct ccw_device *, struct irb *);
if (ccw_device_do_sense(cdev, irb) != 0)
if (ccw_device_do_sense(cdev, irb) == 0) {
ccw_device_do_sense(cdev, irb);
ccw_device_do_sense(cdev, irb);
ccw_device_do_sense(cdev, irb);