1.1 --- a/xenvbd_scsiport/xenvbd.c	Tue Oct 01 13:46:32 2013 +1000
     1.2 +++ b/xenvbd_scsiport/xenvbd.c	Tue Oct 01 18:46:50 2013 +1000
     1.3 @@ -241,6 +241,20 @@ XenVbd_CompleteDisconnect(PXENVBD_DEVICE
     1.4    }
     1.5  }
     1.6  
     1.7 +static VOID
     1.8 +XenVbd_HwScsiTimer(PVOID DeviceExtension) {
     1.9 +  PXENVBD_SCSIPORT_DATA xvsd = DeviceExtension;
    1.10 +  PXENVBD_DEVICE_DATA xvdd = (PXENVBD_DEVICE_DATA)xvsd->xvdd;
    1.11 +
    1.12 +  //FUNCTION_MSG("HwScsiTimer\n");
    1.13 +  XenVbd_HandleEvent(xvdd);
    1.14 +  if (xvsd->outstanding) {
    1.15 +    ScsiPortNotification(RequestTimerCall, xvsd, XenVbd_HwScsiTimer, 100000);
    1.16 +  } else {
    1.17 +    ScsiPortNotification(RequestTimerCall, xvsd, XenVbd_HwScsiTimer, 0);
    1.18 +  }
    1.19 +}
    1.20 +
    1.21  static BOOLEAN
    1.22  XenVbd_HwScsiStartIo(PVOID DeviceExtension, PSCSI_REQUEST_BLOCK srb) {
    1.23    PXENVBD_SCSIPORT_DATA xvsd = DeviceExtension;
    1.24 @@ -297,6 +311,12 @@ XenVbd_HwScsiStartIo(PVOID DeviceExtensi
    1.25    } else {
    1.26      ScsiPortNotification(NextRequest, xvsd);
    1.27    }
    1.28 +  /* if there was an error returned by an SRB then the queue will freeze. Queue a timer to resolve this */
    1.29 +  if (xvsd->outstanding) {
    1.30 +    ScsiPortNotification(RequestTimerCall, xvsd, XenVbd_HwScsiTimer, 100000);
    1.31 +  } else {
    1.32 +    ScsiPortNotification(RequestTimerCall, xvsd, XenVbd_HwScsiTimer, 0);
    1.33 +  }
    1.34    return TRUE;
    1.35  }
    1.36