netdev - [PATCH 2/6] can: ems_usb: cancel urb on -EPIPE and -EPROTO

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Message-Id: <20171208155817.9364-3-mkl@pengutronix.de>
Date:   Fri,  8 Dec 2017 16:58:13 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Martin Kelly <mkelly@...o.com>,
        linux-stable <stable@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 2/6] can: ems_usb: cancel urb on -EPIPE and -EPROTO

From: Martin Kelly <mkelly@...o.com>

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@...o.com>
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/ems_usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index b3d02759c226..b00358297424 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -288,6 +288,8 @@ static void ems_usb_read_interrupt_callback(struct urb *urb)
 
 	case -ECONNRESET: /* unlink */
 	case -ENOENT:
+	case -EPIPE:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		return;
 
-- 
2.15.0