注册设备提供的 ID

如果设备可以为驱动程序提供唯一的标识符，则驱动程序可以直接使用此标识符初始化设备 ID 并使用 Solaris DDI 注册此 ID。

/*
 * The device provides a guaranteed unique identifier,
 * in this case a SCSI3-WWN.  The WWN for the device has been
 * stored in the device's 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);