- Use DeviceNode->State field and its values, instead of DeviceNode->Flags for tracking current node state - Change DNF_* flags to the ones compatible with Windows XP+ - Simplify state changes for device nodes and encapsulate all the logic inside the PiDevNodeStateMachine routine. This makes the ground for future improvements in the device removal sequence and resource management - Now values inside DeviceNode->State and ->Flags are compatible with the windbg !devnode macro and can be tracked using it - BUGFIX: fixed cases where IRP_MN_START_DEVICE or IRP_MN_QUERY_DEVICE_RELATIONS may be sent to a device after a IRP_MN_REMOVE_DEVICE CORE-7826