can: Unify MTU settings for CAN interfaces
CAN interfaces only support MTU values of 16 (CAN 2.0) and 72 (CAN FD).
Setting the MTU to other values is pointless but it does not really hurt.
With the introduction of the CAN FD support in drivers/net/can a new
function to switch the MTU for CAN FD has been introduced.
This patch makes use of this can_change_mtu() function to check for correct
MTU settings also in legacy CAN (2.0) devices.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index 3fcdae2..f5b16e0 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -411,10 +411,16 @@
slcan_devs[i] = NULL;
}
+static int slcan_change_mtu(struct net_device *dev, int new_mtu)
+{
+ return -EINVAL;
+}
+
static const struct net_device_ops slc_netdev_ops = {
.ndo_open = slc_open,
.ndo_stop = slc_close,
.ndo_start_xmit = slc_xmit,
+ .ndo_change_mtu = slcan_change_mtu,
};
static void slc_setup(struct net_device *dev)