can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages

BugLink: http://bugs.launchpad.net/bugs/1731961
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>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 861e90efab86bd5f66f84b1a3038936162ca50ba..9b18d96ef52633ab34bb5ff39f4f643023dc308a 100644 (file)
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -137,6 +137,7 @@ 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
@@ -1301,6 +1302,11 @@ 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);