rwusb.c

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                           0 );

                ASSERT( pRcvBuf->Irp == NULL);
            }        
            
        } // if pending

    } // for


    DEBUGMSG( DBG_FUNC, ("  -CancelPendingReadIo()\n"));

    return (BOOLEAN) cRes;

}


BOOLEAN
CancelPendingWriteIo(
    IN PUSB_DEVICE DeviceExt
    )
/*++



Return Value:

    TRUE if cancelled any, else FALSE

--*/
{
    PUSB_DEVICE device = DeviceExt;
    BOOLEAN cRes = FALSE;
    NTSTATUS timeStat;
    PUSB_CONTEXT pCont;
    ULONGLONG thisContext;  //make ptr arithmetic 64-bit compatible
    int i;

    DEBUGMSG( DBG_FUNC, ("  +CancelPendingWriteIo()\n"));

    ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);


    //
    // Free all resources for the SEND buffer queue.
    //


    thisContext = (ULONGLONG) device->pSendContexts;

    for ( i= 0; i < NUM_SEND_CONTEXTS; i++ ) {

        pCont = (PUSB_CONTEXT)thisContext;

        if( TRUE == pCont->fInUse ) {

            // Get the USB_CONTEXT and cancel it's IRP; the completion routine will itself
            // remove it from the HeadPendingSendList and NULL out HeadPendingSendList
            //  when the last IRP on the list has been  cancelled; that's how we exit this loop
            //

            ASSERT( NULL != pCont->Irp );

            DEBUGMSG( DBG_WARN, ("  CancelPendingWriteIo() about to CANCEL a write IRP!\n"));

            // Completion routine ( USBCompleteWrite() )will free irps, mdls, buffers, etc as well
            cRes = IoCancelIrp( pCont->Irp );

            DEBUGCOND( DBG_ERR, !cRes, ("  CancelPendingWriteIo() COULDN'T CANCEL IRP! 0x%x\n", pCont->Irp ));
            DEBUGCOND( DBG_FUNC, cRes, ("  CancelPendingWriteIo() CANCELLED IRP SUCCESS! 0x%x\n\n", pCont->Irp));

            //
            // Sleep 200 microsecs to give cancellation time to work
            //

            NdisMSleep(200);
        }

        thisContext +=  sizeof( USB_CONTEXT );


    } // for
    
    

    DEBUGMSG( DBG_FUNC, ("  -CancelPendingWriteIo()\n"));

    return (BOOLEAN) cRes;

}

BOOLEAN
CancelPendingControlIo(
    IN PUSB_DEVICE DeviceExt,
    IN PIRP  IrpToCancel,
    IN PKEVENT EventToClear

    )
/*++

  Return Value:
    TRUE if cancelled any, else FALSE

  --*/
{
    PUSB_DEVICE device = DeviceExt;
    BOOLEAN cRes = FALSE;
    NTSTATUS timeStat;

    DEBUGMSG( DBG_FUNC, ("  +CancelPendingControlIo()\n"));

    ASSERT(KeGetCurrentIrql() <= DISPATCH_LEVEL );

    //置于非信号态
    KeClearEvent( EventToClear );
    if(IrpToCancel)
      cRes = IoCancelIrp( IrpToCancel );  //CancelPendingControlIo()

    DEBUGCOND( DBG_ERR, !cRes, ("  CancelPendingControlIo() COULDN'T CANCEL IRP!\n"));
    DEBUGCOND( DBG_FUNC, cRes, ("  CancelPendingControlIo() CANCELLED IRP SUCCESS!\n"));

    if ( cRes ) {
        timeStat = MyKeWaitForSingleObject(
                   device,
                   EventToClear,
                   NULL,  // irp to cancel; we did it above already, so pass NULL
                   0 );
    }


    DEBUGMSG( DBG_FUNC, ("  -CancelPendingControlIo()\n"));

    return (BOOLEAN) cRes;

}


NTSTATUS
CallUSBD(
    IN PUSB_DEVICE Device,
    IN PURB Urb
    )
/*++

Routine Description:
    Passes a URB to the USBD class driver
    The client device driver passes USB request block (URB) structures
    to the class driver as a parameter in an IRP with Irp->MajorFunction
    set to IRP_MJ_INTERNAL_DEVICE_CONTROL and the next IRP stack location
    Parameters.DeviceIoControl.IoControlCode field set to
    IOCTL_INTERNAL_USB_SUBMIT_URB.

Arguments:

    DeviceExt - pointer to the dev ext

    Urb - pointer to an already-formatted Urb request block

Return Value:

    STATUS_SUCCESS if successful,
    STATUS_UNSUCCESSFUL otherwise

--*/
{
    NTSTATUS ntStatus;
    PDEVICE_OBJECT urbTargetDev;
    PIO_STACK_LOCATION nextStack;
    PMDL mdl;

    DEBUGMSG( DBG_FUNC,(" +CallUSBD\n"));

    ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL );

    ASSERT( Device );

    ASSERT( NULL == ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb );  //shouldn't be multiple control calls pending

    //
    // issue a synchronous request (we'll wait )
    
    urbTargetDev = Device->pUsbDevObj;

    ASSERT( urbTargetDev );

	// make an irp sending to usbhub?用IoAllocateIrp来创建Irp其StackSize均要＋1
    ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb = 
            IoAllocateIrp( (CCHAR)(Device->pUsbDevObj->StackSize +1), FALSE );

    if ( NULL == ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb )
    {
        DEBUGMSG(DBG_ERR, ("  CallUsbd failed to alloc IRP\n"));

        ntStatus = STATUS_INSUFFICIENT_RESOURCES;

        goto done;
    }
//STATUS_NOT_SUPPORTED:
  //	The miniclass driver cannot distinguish the target condition
    ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb->IoStatus.Status = STATUS_NOT_SUPPORTED;
    ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb->IoStatus.Information = 0;

    //
    // Call the class driver to perform the operation.  If the returned status
    // is PENDING, wait for the request to complete.
    
    nextStack = IoGetNextIrpStackLocation(((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb);
    ASSERT(nextStack != NULL);

    //
    // pass the URB to the USB driver stack
    //
    nextStack->Parameters.Others.Argument1 = Urb;

    //
    // pass the URB to the USB driver stack
    //
    nextStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
    nextStack->Parameters.Others.Argument1 = Urb;
    nextStack->Parameters.DeviceIoControl.IoControlCode =
        IOCTL_INTERNAL_USB_SUBMIT_URB;


    IoSetCompletionRoutine(
                ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb,      // irp to use
                UsbIoCompleteControl,         // routine to call when irp is done
                DEV_TO_CONTEXT(Device),  // context to pass routine
                TRUE,                      // call on success
                TRUE,                      // call on error
                TRUE);                     // call on cancel
    KeClearEvent(&Device->EventUrb);

    UsbIncIoCount( Device );

    ntStatus =  IoCallDriver( urbTargetDev, ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb );
    DEBUGMSG( DBG_OUT,("CallUSBD () return from IoCallDriver USBD %x\n", ntStatus));

    if ((ntStatus == STATUS_PENDING) || (ntStatus == STATUS_SUCCESS))
	{    //wait  for STATUS_PENDING
        // wait, but dump out on timeout
        if (ntStatus == STATUS_PENDING)
		{
            ntStatus = MyKeWaitForSingleObject( Device, &Device->EventUrb, NULL, 0 );

            if ( ntStatus == STATUS_TIMEOUT )
			{
                DEBUGMSG( DBG_ERR,("CallUSBD () TIMED OUT! return from IoCallDriver USBD %x\n", ntStatus));
                CancelPendingControlIo( Device, ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb, &Device->EventUrb );
            }
        }

    } 
	else
	{
        DEBUGMSG( DBG_ERR, ("CallUSBD IoCallDriver FAILED(%x)\n",ntStatus));
    }

    DEBUGMSG( DBG_OUT,("CallUSBD () URB status = %x  IRP status = %x\n",
        Urb->UrbHeader.Status, ntStatus ));
done:

    ((PUSB_INFO) Device->pUsbInfo)->IrpSubmitUrb = NULL;


    DEBUGCOND( DBG_ERR, !NT_SUCCESS( ntStatus ), ("exit CallUSBD FAILED (%x)\n", ntStatus));

    DEBUGMSG( DBG_FUNC,(" -CallUSBD\n"));

    return ntStatus;
}


/*****************************************************************************
*
*  Function:   UsbIoCompleteControl
*
*  Synopsis:   General completetion routine just to insure cancel-ability of control calls
*              and keep track of pending irp count
*
*  Arguments:  pUsbDevObj - pointer to the  device object which
*                              completed the irp
*              pIrp          - the irp which was completed by the  device
*                              object
*              Context       - dev ext
*
*  Returns:    STATUS_MORE_PROCESSING_REQUIRED - allows the completion routine
*              (IofCompleteRequest) to stop working on the irp.
*
*  This routine is called (by the io manager) in IRQL DISPATCH_LEVEL.
*
*****************************************************************************/

NTSTATUS
UsbIoCompleteControl(
            IN PDEVICE_OBJECT pUsbDevObj,
            IN PIRP           pIrp,
            IN PVOID          Context
            )
{
    PUSB_DEVICE  device;
    NTSTATUS    status;


    DEBUGMSG(DBG_FUNC, ("+UsbIoCompleteControl\n"));

    //
    // The context given to IoSetCompletionRoutine is simply the the ir
    // device object pointer.
    //

    device = CONTEXT_TO_DEV(Context);


    status = pIrp->IoStatus.Status;

    switch (status)
    {
        case STATUS_SUCCESS:
            DEBUGMSG(DBG_OUT, (" UsbIoCompleteControl STATUS_SUCCESS\n"));
            break; // STATUS_SUCCESS

        case STATUS_TIMEOUT:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_TIMEOUT\n"));

            break;

        case STATUS_PENDING:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_PENDING\n"));
            break;

        case STATUS_DEVICE_DATA_ERROR:
        // can get during shutdown
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_DEVICE_DATA_ERROR\n"));

            break;

        case STATUS_UNSUCCESSFUL:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_UNSUCCESSFUL\n"));

            break;

        case STATUS_INSUFFICIENT_RESOURCES:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_INSUFFICIENT_RESOURCES\n"));
            break;

        case STATUS_INVALID_PARAMETER:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_INVALID_PARAMETER\n"));
            break;

        case STATUS_CANCELLED:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_CANCELLED\n"));
            break;

        case STATUS_DEVICE_NOT_CONNECTED:
        // can get during shutdown
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_DEVICE_NOT_CONNECTED\n"));
            break;

        case STATUS_DEVICE_POWER_FAILURE:
        // can get during shutdown
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl STATUS_DEVICE_POWER_FAILURE\n"));
            break;

        default:
            DEBUGMSG(DBG_ERR, (" UsbIoCompleteControl UNKNOWN WEIRD STATUS = 0x%x, dec %d\n",status,status ));
            //ASSERT( 0 );

            break;
    }


    UsbDecIoCount( device );  //we track pending irp count

    if  ( pIrp == ((PUSB_INFO) device->pUsbInfo)->IrpSubmitUrb ) 
	{
        ASSERT( NULL != ((PUSB_INFO) device->pUsbInfo)->IrpSubmitUrb );

        IoFreeIrp( ((PUSB_INFO) device->pUsbInfo)->IrpSubmitUrb );

        device->StatusControl =  status; // save status because can't use irp after completion routine is hit!
        KeSetEvent(&device->EventUrb, 0, FALSE);  //signal we're done

    }
	else
	{
        DEBUGMSG( DBG_ERR, (" UsbIoCompleteControl UNKNOWN IRP\n"));
        ASSERT( 0 );
    }



    DEBUGCOND(DBG_ERR, !( NT_SUCCESS( status ) ), ("UsbIoCompleteControl BAD status = 0x%x\n", status));

    DEBUGMSG(DBG_FUNC, ("-UsbIoCompleteControl\n"));


    // We return STATUS_MORE_PROCESSING_REQUIRED so that the completion
    // routine (IofCompleteRequest) will stop working on the irp.
    //

    status = STATUS_MORE_PROCESSING_REQUIRED;

    return status;
}

//******************************************************************************
//
// ResetPipe()
//
// This will reset the host pipe to Data0 and should also reset the device
// endpoint to Data0 for Bulk and Interrupt pipes by issuing a Clear_Feature
// Endpoint_Stall to the device endpoint.
//
// Must be called at IRQL PASSIVE_LEVEL
//
//******************************************************************************

NTSTATUS
ResetPipe (
    IN PUSB_DEVICE   Device,
    IN HANDLE Pipe
    )
{
    PURB        urb;
    NTSTATUS    ntStatus;