[PATCH 3.2 035/140] can: ems_usb: cancel urb on -EPIPE and -EPROTO

Ben Hutchings
2018-02-28T15:27:12Z

From: Martin Kelly <mkelly@xevo.com>

commit bd352e1adfe0d02d3ea7c8e3fb19183dc317e679 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: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/can/usb/ems_usb.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -292,6 +292,8 @@ static void ems_usb_read_interrupt_callb

case -ECONNRESET: /* unlink */
case -ENOENT:
+ case -EPIPE:
+ case -EPROTO:
case -ESHUTDOWN:
return;