usb插拔,IRP_MN_SURPRISE_REMOVAL与IRP_MN_REMOVE_DEVICE该如何处理

zigeno 2014-08-04 03:32:06

usb插拔,IRP_MN_SURPRISE_REMOVAL与IRP_MN_REMOVE_DEVICE该如何处理

USB的URB数据循环如下：

NTSTATUS IsoStreamTransferComplete(
IN PDEVICE_OBJECT bunkfdo,
IN PIRP Irp,
IN PVOID Context
)
{
……
IoSetCompletionRoutine(Irp,
IsoStreamTransferComplete,
transferObject,
TRUE,
TRUE,
TRUE);
if (Working == pdx->DeviceState)
status = IoCallDriver(pdx->StackDeviceObject,Irp);

……
}

当USB设备意外被拔下时：
NTSTATUS USB_DispatchPnp(
IN PDEVICE_OBJECT fdo,
IN PIRP Irp
)
{
……
case IRP_MN_SURPRISE_REMOVAL:
{
KeAcquireSpinLock(&pdx->DevStateLock, &oldIrql);
SET_NEW_PNP_STATE(pdx, SurpriseRemoved);
KeReleaseSpinLock(&pdx->DevStateLock, oldIrql);

ntStatus = USB_DefaultPnpHandler(fdo, Irp);
}
break;

case IRP_MN_REMOVE_DEVICE:
{
KeAcquireSpinLock(&pdx->DevStateLock, &oldIrql);
SET_NEW_PNP_STATE(pdx, Removed);
KeReleaseSpinLock(&pdx->DevStateLock, oldIrql);

for (i = 0; i < pdx->Interface->NumberOfPipes; i++)
{
USB_AbortPipe(fdo,(USBD_PIPE_HANDLE) pdx->Interface->Pipes[i].PipeHandle);
}

UnlockDevice(fdo); // once for LockDevice at start of dispatch
UnlockDevice(fdo); // once for initialization during AddDevice

KeWaitForSingleObject(&pdx->evRemove, Executive, KernelMode, FALSE, NULL);

if (pdx->DeviceDescriptor)
{
ExFreePool(pdx->DeviceDescriptor);
}

if (pdx->Interface != NULL)
{
ExFreePool(pdx->Interface);
}

if (pdx->NeedCleanup)
{
UNICODE_STRING deviceLinkUnicodeString;

pdx->NeedCleanup = FALSE;

RtlInitUnicodeString (&deviceLinkUnicodeString,
pdx->DeviceLinkNameBuffer);

IoDeleteSymbolicLink(&deviceLinkUnicodeString);
}

IoDetachDevice(pdx->StackDeviceObject);

IoDeleteDevice (fdo);

ntStatus = USB_DefaultPnpHandler(fdo, Irp);
}
break;
……
}

运行时，拔下USB设备：
有时候PC正常运行，再次插上USB设备，设备能够恢复正常工作。
有时候PC卡死（无法响应鼠标键盘操作）

请问程序中IRP_MN_SURPRISE_REMOVAL与IRP_MN_REMOVE_DEVICE哪里处理不当？

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