batman-adv: only store changed gw_bandwidth values

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>

net/batman-adv/gateway_common.c

@@ -162,6 +162,9 @@ ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count)
 	 **/
 	gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, &down, &up);
 
+	if (atomic_read(&bat_priv->gw_bandwidth) == gw_bandwidth_tmp)
+		return count;
+
 	gw_deselect(bat_priv);
 	bat_info(net_dev,
 		 "Changing gateway bandwidth from: '%i' to: '%ld' (propagating: %d%s/%d%s)\n",