css_driver_register
return css_driver_register(&chsc_subchannel_driver);
EXPORT_SYMBOL_GPL(css_driver_register);
extern int css_driver_register(struct css_driver *);
ret = css_driver_register(&io_subchannel_driver);
ret = css_driver_register(&eadm_subchannel_driver);
ret = css_driver_register(&vfio_ccw_sch_driver);