tipc: reset bearer if device carrier not ok

If we detect that under lying carrier detects errors and goes down,
we reset the bearer.

Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/bearer.c

@@ -609,16 +609,18 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 
 	switch (evt) {
 	case NETDEV_CHANGE:
-		if (netif_carrier_ok(dev))
+		if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
+			test_and_set_bit_lock(0, &b->up);
 			break;
-		/* else: fall through */
-	case NETDEV_UP:
-		test_and_set_bit_lock(0, &b->up);
-		break;
+		}
+		/* fall through */
 	case NETDEV_GOING_DOWN:
 		clear_bit_unlock(0, &b->up);
 		tipc_reset_bearer(net, b);
 		break;
+	case NETDEV_UP:
+		test_and_set_bit_lock(0, &b->up);
+		break;
 	case NETDEV_CHANGEMTU:
 		if (tipc_mtu_bad(dev, 0)) {
 			bearer_disable(net, b);