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, janderwald(a)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