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

[Thomas Faber]

On 2016-09-18 16:24, janderwald at svn.reactos.org 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