[PATCH 4.14 016/164] can: ems_usb: cancel urb on -EPIPE and -EPROTO

From: Greg Kroah-Hartman
Date: Tue Dec 12 2017 - 07:46:40 EST


4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Martin Kelly <mkelly@xxxxxxxx>

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@xxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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
@@ -288,6 +288,8 @@ static void ems_usb_read_interrupt_callb

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