tdi filter help!!

在pcausa提供的tdi filter passthru例子中，在处理TDI_ASSOCIATE_ADDRESS的时候，为什么关联的pTcpConn->tc_FileObject和
pAddrObj->ao_FileObject不同，难道他们是用不同的FileObject打开的，为什么会这样?
源代码如下：
NTSTATUS
TDIH_TdiAssociateAddressComplete(
PDEVICE_OBJECT    pDeviceObject,
PIRP  Irp,
void* Context
)
{
PTDIH_DeviceExtension pTDIH_DeviceExtension = NULL;
BOOLEAN CanDetachProceed = FALSE;
PDEVICE_OBJECT pAssociatedDeviceObject = NULL;
NTSTATUS Status = Irp->IoStatus.Status;
TCPConn* pTCPConn = (TCPConn*) NULL;
PIO_STACK_LOCATION IrpSp = NULL;
PTDI_REQUEST_KERNEL_ASSOCIATE p;
PFILE_OBJECT pFileObject = NULL;

.........
.........

//
// Locate TCP Connection Object
//
pTCPConn = TDIH_GetConnFromFileObject(IrpSp->FileObject);

if (pTCPConn)
{
KdPrint(("  Found TCPConn To Associaten"));
ASSERT(!pTCPConn->tc_ao);

//
// Locate The Transport Address Object
//
p = (PTDI_REQUEST_KERNEL_ASSOCIATE) & IrpSp->Parameters;

//
// Obtain a referenced pointer to the file object.
//
ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);

:(:(:(:(:(:(:(:(:(:(:(
//
//!!!!!!!!为什么需要得到FileObject，直接用IrpSp->FileObject有何不妥？？？
//
:(:(:(:(:(:(:(:(:(:(:(

Status = ObReferenceObjectByHandle(p->AddressHandle,  // Object Handle
FILE_ANY_ACCESS,   // Desired Access
NULL,   // Object Type
KernelMode, // Processor mode
(PVOID *) &pFileObject, // File Object pointer
NULL   // Object Handle information
);

if (NT_SUCCESS(Status))
{
AddrObj* pAddrObj;

pAddrObj = TDIH_GetAddrObjFromFileObject(pFileObject);

ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
ObDereferenceObject(pFileObject);

if (pAddrObj)
{
KdPrint(("  Found AddrObj To Associaten"));

pTCPConn->tc_ao = pAddrObj;
}
}
}
}
.........
.........
return(STATUS_SUCCESS);
}

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