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

[Ben Hutchings]

3.2.100-rc1 review patch.  If anyone has any objections, please let me know.

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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: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 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;