identify(9E) is obsolete and no longer required. identify(9E) was used to determine whether a driver drove the device pointed to by dip. identify(9E) is currently supported only to provide backward compatibility with older drivers and should not be implemented. Set this entry point to nulldev(9F).
The framework now handles unit counting. To get the unit number in any routine, call ddi_get_instance(9F). Do not count units anywhere.