[PATCH] fix for potential NULL pointer dereference with bare lan743x

[Sergej Bauer]

  This is just a minor fix which prevents a kernel NULL pointer
dereference when using phy-less lan743x.

Signed-off-by: Sergej Bauer <sba...@blackbox.su>
---
 drivers/net/ethernet/microchip/lan743x_ethtool.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c 
b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index dcde496da7fb..354d72d550f2 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -780,7 +780,9 @@ static void lan743x_ethtool_get_wol(struct net_device 
*netdev,
 
        wol->supported = 0;
        wol->wolopts = 0;
-       phy_ethtool_get_wol(netdev->phydev, wol);
+
+       if (netdev->phydev)
+               phy_ethtool_get_wol(netdev->phydev, wol);
 
        wol->supported |= WAKE_BCAST | WAKE_UCAST | WAKE_MCAST |
                WAKE_MAGIC | WAKE_PHY | WAKE_ARP;
@@ -793,6 +795,9 @@ static int lan743x_ethtool_set_wol(struct net_device 
*netdev,
 {
        struct lan743x_adapter *adapter = netdev_priv(netdev);
 
+       if (!netdev->phydev)
+               return -EIO;
+
        adapter->wolopts = 0;
        if (wol->wolopts & WAKE_UCAST)
                adapter->wolopts |= WAKE_UCAST;
-- 
2.20.1