Re: [ros-dev] [ros-diffs] [janderwald] 72725: [USBAUDIO] - start implementing init routines - not yet added to build

[Thomas Faber]

On 2016-09-18 16:24, [e-mail] wrote:
> +NTSTATUS
> +SubmitUrbSync(
> IN PKSDEVICE Device,
> IN PURB Urb)
>
> +{
> PIRP Irp;
> KEVENT Event;
> PDEVICE_EXTENSION DeviceExtension;
> IO_STATUS_BLOCK IoStatus;
> PIO_STACK_LOCATION IoStack;
> NTSTATUS Status;
> // init event
> KeInitializeEvent(&Event, NotificationEvent, FALSE);
> // get device extension
> DeviceExtension = (PDEVICE_EXTENSION)Device->Context;
> // build irp
> Irp = IoBuildDeviceIoControlRequest(IOCTL_INTERNAL_USB_SUBMIT_URB,
>    DeviceExtension->LowerDevice,
>    NULL,
>    0,
>    NULL,
>    0,
>    TRUE,
>    &Event,
>    &IoStatus);
> if (!Irp)
> {
>    //
>    // no memory
>    //
>    return STATUS_INSUFFICIENT_RESOURCES;
> }
> // get next stack location
> IoStack = IoGetNextIrpStackLocation(Irp);
> // store urb
> IoStack->Parameters.Others.Argument1 = Urb;
> // set completion routine
> IoSetCompletionRoutine(Irp, USBAudioCancelCompleteSynch, &Event, TRUE, TRUE, TRUE);

You don't need a completion routine here, completing the IRP will set
the event specified in IoBuildDeviceIoControlRequest.
See https://support.microsoft.com/en-us/kb/326315#bookmark-2