紧急求助

我现在正在做给笔记本的PCMCIA的Sram卡写驱动程序，遇到了一个非常奇怪的问题，请大家帮帮忙
１、我的inf文件的Class是MTD。
２、在AddDevice的时候没有错误返回。
３、在进行DispatchPnp处理IRP_MN_START_DEVICE的时候，一调用IoCallDriver的时候，笔记本就发出鸣叫声，然后返回的错误是STATUS_INSUFFICIENT_RESOURCES。

我真的不知道是哪里错了，希望大家帮帮我

附件是我的代码。

NTSTATUS DispatchPnp(PDEVICE_OBJECT fdo, PIRP Irp)
{ // DispatchPnp
NTSTATUS stat;
PDEVICE_EXTENSION pDe=(PDEVICE_EXTENSION)fdo->DeviceExtension;
PIO_STACK_LOCATION pIrpStk=IoGetCurrentIrpStackLocation(Irp);
KEVENT event;

stat = IoAcquireRemoveLock(&pDe->RemoveLock,NULL);
if( !NT_SUCCESS(stat) ) return CompleteRequest(Irp,stat,0);

switch( pIrpStk->MinorFunction ) {
case IRP_MN_START_DEVICE:
IoCopyCurrentIrpStackLocationToNext(Irp);

KeInitializeEvent(&event,NotificationEvent,FALSE);

IoSetCompletionRoutine(Irp,
(PIO_COMPLETION_ROUTINE)CompletionRoutine,&event,
TRUE,TRUE,TRUE);

//stat = PnpDefaHand(fdo,Irp);
stat = IoCallDriver(pDe->LowerDeviceObject,Irp);
if( stat==STATUS_PENDING ) {
KeWaitForSingleObject(&event,Executive,KernelMode,FALSE,NULL);
stat = Irp->IoStatus.Status;
}
if( !NT_SUCCESS(stat) ) {
stat = CompleteRequest(Irp,stat,Irp->IoStatus.Information);
break;
}
stat = StartDevice(fdo,pIrpStk);
if( NT_SUCCESS(stat) ) IoSetDeviceInterfaceState(&pDe->ifname,TRUE);
stat = CompleteRequest(Irp,stat,0);
break;
case IRP_MN_QUERY_STOP_DEVICE:
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
break;
case IRP_MN_QUERY_REMOVE_DEVICE:
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
break;
case IRP_MN_SURPRISE_REMOVAL:
RemoveDevice(Irp,pDe);
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
break;
case IRP_MN_REMOVE_DEVICE:
IoReleaseRemoveLockAndWait(&pDe->RemoveLock,Irp);
RemoveDevice(Irp,pDe);
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
IoSetDeviceInterfaceState(&pDe->ifname,FALSE);
RtlFreeUnicodeString(&pDe->ifname);
IoDetachDevice(pDe->LowerDeviceObject);
IoDeleteDevice(fdo);
return stat;
case IRP_MN_STOP_DEVICE:
RemoveDevice(Irp,pDe);
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
break;
case IRP_MN_CANCEL_REMOVE_DEVICE:
case IRP_MN_CANCEL_STOP_DEVICE:
Irp->IoStatus.Status = STATUS_SUCCESS;
stat = PnpDefaHand(fdo,Irp);
break;
/*case IRP_MN_QUERY_INTERFACE:
stat = IoCallDriver(pDe->LowerDeviceObject,Irp);
if( stat==STATUS_PENDING ) {
KeWaitForSingleObject(&event,Executive,KernelMode,FALSE,NULL);
stat = Irp->IoStatus.Status;
}
if( !NT_SUCCESS(stat) )
{
stat = CompleteRequest(Irp,stat,Irp->IoStatus.Information);
}
break;*/
case 0x18:
break;
default:
stat = PnpDefaHand(fdo,Irp);
}
if( !NT_SUCCESS(stat) )
{
stat = stat;
}

IoReleaseRemoveLock(&pDe->RemoveLock,NULL);
return stat;
}