is there WDM API function to obtain parent device node in kernel mode? I know that _DEVICE_NODE->Parent points to parent node, but _DEVICE_NODE isn't officially documented. For KMDF there is WdfPdoGetParent available and for user mode CM_Get_Parent. In portingtables.doc (Summary of KMDF and WDM Equivalents) there is no WDM equivalent for WdfPdoGetParent. So is there really no way how to get it?