4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jimmy Assarsson <jimmyassarsson@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/can/usb/kvaser_usb.c | 6 ++++++ 1 file changed, 6 insertions(+) --- 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(cons #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(co 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);