我是菜鸟,walter Oney的驱动书,第5章.完成例程这一节.

A variation on this idea occurs when you create an asynchronous IRP of some kind. You’re supposed to provide a completion routine to free the IRP, and you’ll necessarily return STATUS_MORE_PROCESSING_REQUIRED from that completion routine to prevent IoCompleteRequest from attempting to do any more work on an IRP that has disappeared:

SOMETYPE SomeFunction()
  {
  PIRP Irp = IoBuildAsynchronousFsdRequest(...);
  IoSetCompletionRoutine(Irp, MyCompletionRoutine, ...);
  IoCallDriver(...);
  }

NTSTATUS MyCompletionRoutine(PDEVICE_OBJECT junk, PIRP Irp,
  PVOID context)
  {
  if (Irp->PendingReturned)
    IoMarkIrpPending(Irp); // <== oops!
  IoFreeIrp(Irp);
  return STATUS_MORE_PROCESSING_REQUIRED;
  }
The problem here is that there is no current stack location inside this completion routine! Consequently,

"问题在于完成例程没有目前的堆栈单元,因此,IoMarkIRPPending会修改一段任意的内存空间".这句该怎么理解

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