[PATCH] net: arc_emac: Add support for ndo_do_ioctl net_device_ops operation

[Romain Perier]

This operation is required for handling ioctl commands like SIOCGMIIREG,
when debugging MDIO registers from userspace.

This commit adds support for this operation.

Signed-off-by: Romain Perier <romain.per...@collabora.com>
---
 drivers/net/ethernet/arc/emac_main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/ethernet/arc/emac_main.c 
b/drivers/net/ethernet/arc/emac_main.c
index 68de2f2652f2..3241af1ce718 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -720,6 +720,18 @@ static int arc_emac_set_address(struct net_device *ndev, 
void *p)
        return 0;
 }
 
+static int arc_emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+       if (!netif_running(dev))
+               return -EINVAL;
+
+       if (!dev->phydev)
+               return -ENODEV;
+
+       return phy_mii_ioctl(dev->phydev, rq, cmd);
+}
+
+
 static const struct net_device_ops arc_emac_netdev_ops = {
        .ndo_open               = arc_emac_open,
        .ndo_stop               = arc_emac_stop,
@@ -727,6 +739,7 @@ static const struct net_device_ops arc_emac_netdev_ops = {
        .ndo_set_mac_address    = arc_emac_set_address,
        .ndo_get_stats          = arc_emac_stats,
        .ndo_set_rx_mode        = arc_emac_set_rx_mode,
+       .ndo_do_ioctl           = arc_emac_ioctl,
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = arc_emac_poll_controller,
 #endif
-- 
2.11.0