can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages

commit e1d2d1329a5722dbecc9c278303fcc4aa01f8790 upstream.

To avoid kernel warning "Unhandled message (68)", ignore the
CMD_FLUSH_QUEUE_REPLY message for now.

As of Leaf v2 firmware version v4.1.844 (2017-02-15), flush tx queue is
synchronous. There is a capability bit indicating whether flushing tx
queue is synchronous or asynchronous.

A proper solution would be to query the device for capabilities. If the
synchronous tx flush capability bit is set, we should wait for
CMD_FLUSH_QUEUE_REPLY message, while flushing the tx queue.

Signed-off-by: Jimmy Assarsson <jimmyassarsson@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index ddff13d1dc94e40d784fd577105e51d9fa4e79e3..c2e2821a3346407b7f7e43629df2e0fd6ac7b676 100644 (file)
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -134,6 +134,7 @@ static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
 #define CMD_RESET_ERROR_COUNTER                49
 #define CMD_TX_ACKNOWLEDGE             50
 #define CMD_CAN_ERROR_EVENT            51
+#define CMD_FLUSH_QUEUE_REPLY          68
 
 #define CMD_LEAF_USB_THROTTLE          77
 #define CMD_LEAF_LOG_MESSAGE           106
@@ -1297,6 +1298,11 @@ static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
                        goto warn;
                break;
 
+       case CMD_FLUSH_QUEUE_REPLY:
+               if (dev->family != KVASER_LEAF)
+                       goto warn;
+               break;
+
        default:
 warn:          dev_warn(dev->udev->dev.parent,
                         "Unhandled message (%d)\n", msg->id);