[net 1/5] ixgbe: Return error when getting PHY address if PHY access is not supported

[Jeff Kirsher]

From: Mark D Rustad <mark.d.rus...@intel.com>

In cases where PHY register access is not supported, don't mislead
a caller into thinking that it is supported by returning a PHY
address. Instead, return -EOPNOTSUPP when PHY access is not
supported.

Signed-off-by: Mark Rustad <mark.d.rus...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index d962368d08d0..822cdb4f2c25 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8529,6 +8529,10 @@ static int ixgbe_ioctl(struct net_device *netdev, struct 
ifreq *req, int cmd)
                return ixgbe_ptp_set_ts_config(adapter, req);
        case SIOCGHWTSTAMP:
                return ixgbe_ptp_get_ts_config(adapter, req);
+       case SIOCGMIIPHY:
+               if (!adapter->hw.phy.ops.read_reg)
+                       return -EOPNOTSUPP;
+               /* fall through */
        default:
                return mdio_mii_ioctl(&adapter->hw.phy.mdio, if_mii(req), cmd);
        }
-- 
2.14.2