tg3: copy only needed fields from userspace-provided EEE data

The current code overwrites fields in tp->eee with unchecked data from
edata, e.g. the bitmap with supported modes. ethtool properly returns
the received data from get_eee() call, but we have no guarantee that
other users of the ioctl set_eee() interface behave properly too.
Therefore copy only fields which are actually needed.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/tg3.c

@@ -14200,7 +14200,9 @@ static int tg3_set_eee(struct net_device *dev, struct ethtool_keee *edata)
 		return -EINVAL;
 	}
 
-	tp->eee = *edata;
+	tp->eee.eee_enabled = edata->eee_enabled;
+	tp->eee.tx_lpi_enabled = edata->tx_lpi_enabled;
+	tp->eee.tx_lpi_timer = edata->tx_lpi_timer;
 
 	tp->phy_flags |= TG3_PHYFLG_USER_CONFIGURED;
 	tg3_warn_mgmt_link_flap(tp);