net: switchdev: don't abort unsupported operations

There is no need to abort attribute setting or object addition, if the
prepare phase returned operation not supported.

Thus, abort these two transactions only if the error is not -EOPNOTSUPP.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/switchdev/switchdev.c

@@ -171,8 +171,10 @@ int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr)
 		 * released.
 		 */
 
+		if (err != -EOPNOTSUPP) {
 			attr->trans = SWITCHDEV_TRANS_ABORT;
 			__switchdev_port_attr_set(dev, attr);
+		}
 
 		return err;
 	}
@@ -249,8 +251,10 @@ int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
 		 * released.
 		 */
 
+		if (err != -EOPNOTSUPP) {
 			obj->trans = SWITCHDEV_TRANS_ABORT;
 			__switchdev_port_obj_add(dev, obj);
+		}
 
 		return err;
 	}