Patch "can: kvaser_usb: cancel urb on -EPIPE and -EPROTO" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    can: kvaser_usb: cancel urb on -EPIPE and -EPROTO

to the 4.4-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-cancel-urb-on-epipe-and-eproto.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6aa8d5945502baf4687d80de59b7ac865e9e666b Mon Sep 17 00:00:00 2001
From: Martin Kelly <mkelly@xevo.com>
Date: Tue, 5 Dec 2017 11:15:49 -0800
Subject: can: kvaser_usb: cancel urb on -EPIPE and -EPROTO

From: Martin Kelly <mkelly@xevo.com>

commit 6aa8d5945502baf4687d80de59b7ac865e9e666b upstream.

In mcba_usb, we have observed that when you unplug the device, the driver will
endlessly resubmit failing URBs, which can cause CPU stalls. This issue
is fixed in mcba_usb by catching the codes seen on device disconnect
(-EPIPE and -EPROTO).

This driver also resubmits in the case of -EPIPE and -EPROTO, so fix it
in the same way.

Signed-off-by: Martin Kelly <mkelly@xevo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/usb/kvaser_usb.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -1322,6 +1322,8 @@ static void kvaser_usb_read_bulk_callbac
 	case 0:
 		break;
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 	default:


Patches currently in stable-queue which might be from mkelly@xevo.com are

queue-4.4/can-ems_usb-cancel-urb-on-epipe-and-eproto.patch
queue-4.4/can-esd_usb2-cancel-urb-on-epipe-and-eproto.patch
queue-4.4/can-usb_8dev-cancel-urb-on-epipe-and-eproto.patch
queue-4.4/can-kvaser_usb-cancel-urb-on-epipe-and-eproto.patch