From: Martin Kelly <mkelly@xevo.com>
Date: Tue, 5 Dec 2017 19:15:49 +0000 (-0800)
Subject: can: kvaser_usb: cancel urb on -EPIPE and -EPROTO
X-Git-Tag: v3.18.88~61
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bead22ffc679dd16c96062c9286d24a7d23b2021;p=thirdparty%2Fkernel%2Fstable.git

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

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>
---

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 23d5f4ed6acde..4745164e43253 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -981,6 +981,8 @@ static void kvaser_usb_read_bulk_callback(struct urb *urb)
 	case 0:
 		break;
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 	default: