IWDTFPNPAction2::EDTTryStopDeviceFailRestart method (wdtfpnpaction.h)

Article
02/22/2024

Attempts to send an IRP_MN_STOP_DEVICE event to the target device and then fail the subsequent device restart.

Syntax

HRESULT EDTTryStopDeviceFailRestart(
  [out, retval] VARIANT_BOOL *pbSuccess
);

Parameters

[out, retval] pbSuccess

True if the operation succeeds; otherwise, false.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

Note The IWDTFEnhancedDeviceTestSupportAction2::Enable method must be called for the target device before calling this method.

EDTTryStopDeviceFailRestart attempts to trigger a PnP resource rebalance (a Query Stop, Stop, Start IRP sequence) in which it fails the IRP_MN_START_DEVICE event which follows a successful Query Stop and Stop. The failed Start IRP, in turn, causes the system to surprise remove the device (IRP_MN_SURPRISE_REMOVAL).

The Stop IRP is not guaranteed. Other drivers on the stack can fail an IRP_MN_QUERY_STOP_DEVICE event which precedes the Stop IRP (resulting in IRP_MN_CANCEL_STOP_DEVICE). Also, the system may optimize if it detects that the target device does not use hardware resources (e.g. a USB mouse) and send a CancelStop IRP instead.

If your device does not consume hardware resources but you still wish to attempt to test how the drivers and applications handle the PnP resource rebalance with a failed start, you can instead run the EDTTryStopDeviceFailRestart method on a parent device, grandparent, etc., which does consume hardware resources. For example, if your device is a USB mouse, you can run this method on the parent USB controller instead.

Requirements

Requirement	Value
Minimum supported client	Windows XP Professional
Minimum supported server	Windows Server 2008
Target Platform	Desktop
Header	wdtfpnpaction.h