e1000e: return appropriate errors for 'ethtool -r'

...when invoked while interface is not up or when auto-negotiation is
disabled as done by other drivers.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index 0c0859925468..65ef9b5548d8 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -1963,8 +1963,15 @@ static int e1000_set_coalesce(struct net_device *netdev,
 static int e1000_nway_reset(struct net_device *netdev)
 {
         struct e1000_adapter *adapter = netdev_priv(netdev);
-        if (netif_running(netdev))
-                e1000e_reinit_locked(adapter);
+
+        if (!netif_running(netdev))
+                return -EAGAIN;
+
+        if (!adapter->hw.mac.autoneg)
+                return -EINVAL;
+
+        e1000e_reinit_locked(adapter);
+
         return 0;
 }