Patch "can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
can-kvaser_usb-ignore-cmd_flush_queue_reply-messages.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Jimmy Assarsson <[email protected]>
Date: Tue, 24 Oct 2017 12:23:29 +0200
Subject: can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages

From: Jimmy Assarsson <[email protected]>

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.

---
 drivers/net/can/usb/kvaser_usb.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -137,6 +137,7 @@ 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

@@ -1301,6 +1302,11 @@ 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);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/can-kvaser_usb-correct-return-value-in-printout.patch queue-4.9/can-kvaser_usb-ignore-cmd_flush_queue_reply-messages.patch