net: mtk: make sfp switch work (but switch back causes deadlock)

Author: frank-w

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -4973,7 +4973,6 @@ static void mux_poll(struct work_struct *work)
 
 	rtnl_lock();
 	mtk_stop(dev);
-	rtnl_unlock();
 
 	/* Destroy old phylink if it exists */
 	if (mux->data[mux->channel] && mux->data[mux->channel]->phylink) {
@@ -4984,6 +4983,7 @@ static void mux_poll(struct work_struct *work)
 		phylink_destroy(mux->data[mux->channel]->phylink);
 		mux->data[mux->channel]->phylink = NULL;
 	}
+	rtnl_unlock();
 
 	dev_info(eth->dev, "ethernet mux: switch to channel%d\n", new_channel);
 
@@ -5004,7 +5004,7 @@ static void mux_poll(struct work_struct *work)
 	mac->of_node = mux->data[new_channel]->of_node;
 	mac->phylink = mux->data[new_channel]->phylink;
 
-	rtnl_lock();//only for mtk_open/phylink_start
+	rtnl_lock();
 	mtk_open(dev);
 
 	rtnl_unlock();