EVT_WDF_DEVICE_QUERY_REMOVE callback function (wdfdevice.h)

[Applies to KMDF and UMDF]

A driver's EvtDeviceQueryRemove event callback function determines whether a specified device can be stopped and removed.

Syntax

EVT_WDF_DEVICE_QUERY_REMOVE EvtWdfDeviceQueryRemove;

NTSTATUS EvtWdfDeviceQueryRemove(
  [in] WDFDEVICE Device
)
{...}

Parameters

[in] Device

A handle to a framework device object.

Return value

If the driver determines that the device can be stopped and removed, the EvtDeviceQueryRemove callback function must return STATUS_SUCCESS or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise it must return a status value for which NT_SUCCESS(status) equals FALSE. Do not return STATUS_NOT_SUPPORTED.

Remarks

To register an EvtDeviceQueryRemove callback function, a driver must call WdfDeviceInitSetPnpPowerEventCallbacks.

If the device and driver support idle power-down, the device might not be in its working state when the framework calls the driver's EvtDeviceQueryRemove callback function. The callback function can call WdfDeviceStopIdle to force the device into its working (D0) state, and then the callback function can call WdfDeviceResumeIdle before it returns.

For more information about the EvtDeviceQueryRemove callback function, see Handling Requests to Stop a Device.

The framework does not synchronize the EvtDeviceQueryRemove callback function with other PnP and power management callback functions. For information about how the framework synchronizes the execution of a driver's event callback functions, see Using Automatic Synchronization.

Requirements

See also

EvtDeviceQueryStop