From: Martin Kelly <mkelly@xevo.com>
Date: Tue, 5 Dec 2017 19:15:50 +0000 (-0800)
Subject: can: usb_8dev: cancel urb on -EPIPE and -EPROTO
X-Git-Tag: v4.4.106~98
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d73fcef16da050b6a6db8c86d8f4a69836d9b5e7;p=thirdparty%2Fkernel%2Fstable.git

can: usb_8dev: cancel urb on -EPIPE and -EPROTO

commit 12147edc434c9e4c7c2f5fee2e5519b2e5ac34ce 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/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 449b2a47f9a89..522286cc0f9ca 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -524,6 +524,8 @@ static void usb_8dev_read_bulk_callback(struct urb *urb)
 		break;
 
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;