net: phy: read MII_CTRL1000 in genphy_read_status only if needed

Value of MII_CTRL1000 is needed only if LPA_1000MSFAIL is set.
Therefore move reading this register.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/phy_device.c

@@ -1784,7 +1784,7 @@ EXPORT_SYMBOL(genphy_update_link);
  */
 int genphy_read_status(struct phy_device *phydev)
 {
-	int adv, lpa, lpagb, err, old_link = phydev->link;
+	int lpa, lpagb, err, old_link = phydev->link;
 
 	/* Update the link, but return if there was an error */
 	err = genphy_update_link(phydev);
@@ -1806,11 +1806,12 @@ int genphy_read_status(struct phy_device *phydev)
 			if (lpagb < 0)
 				return lpagb;
 
-			adv = phy_read(phydev, MII_CTRL1000);
-			if (adv < 0)
-				return adv;
-
 			if (lpagb & LPA_1000MSFAIL) {
+				int adv = phy_read(phydev, MII_CTRL1000);
+
+				if (adv < 0)
+					return adv;
+
 				if (adv & CTL1000_ENABLE_MASTER)
 					phydev_err(phydev, "Master/Slave resolution failed, maybe conflicting manual settings?\n");
 				else