ravb: remove useless serialization in ravb_get_link_ksettings()

phy_ethtool_ksettings_get() call does not modify device state or device
driver state, hence there is no need to utilize a driver specific
spinlock.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb_main.c

@@ -1109,15 +1109,10 @@ static int ravb_phy_start(struct net_device *ndev)
 static int ravb_get_link_ksettings(struct net_device *ndev,
 				   struct ethtool_link_ksettings *cmd)
 {
-	struct ravb_private *priv = netdev_priv(ndev);
-	unsigned long flags;
-
 	if (!ndev->phydev)
 		return -ENODEV;
 
-	spin_lock_irqsave(&priv->lock, flags);
 	phy_ethtool_ksettings_get(ndev->phydev, cmd);
-	spin_unlock_irqrestore(&priv->lock, flags);
 
 	return 0;
 }