IoGetAttachedDevice

VOID __stdcall IoGetAttachedDevice(_DEVICE_OBJECT *DeviceObject){
  __int64 i; 
  for( i = *((_QWORD *)DeviceObject + 3); i; i = *(_QWORD *)(i + 24) )
    ;
}

Referenced by:

FsRtlQueryOpen
IoAdjustStackSizeForRedirection
IoGetAttachedDeviceReferenceWithTag
IopAttachDeviceToDeviceStackSafe
IopCloseFile
IopCopyOffloadCapable
IopDeleteFile
IopParseDevice
IopShutdownBaseFileSystems
IopXxxControlFile
NtQueryInformationFile
NtSetInformationFile
NtUnlockFile
PipSendGuestAssignedNotification
VfFilterAttach