Registering a Device-Supplied ID

If the device can supply the driver with an identifier that is unique, the driver can simply initialize the device ID with this identifier and register the ID with the Solaris DDI.

/*
 * The device provides a guaranteed unique identifier,
 * in this case a SCSI3-WWN.  The WWN for the device has been
 * stored in the devices soft state.
 */
if (ddi_devid_init(dip, DEVID_SCSI3_WWN, un->un_wwn_len, un->un_wwn,
    &un->un_devid) != DDI_SUCCESS)
        return (DDI_FAILURE);

(void) ddi_devid_register(dip, un->un_devid);