gianfar: Check if phydev present on ethtool -A

This fixes a seg fault on 'ethtool -A' entry if the
interface is down.  Obviously we need to have the
phy device initialized / "connected" (see of_phy_connect())
to be able to advertise pause frame capabilities.

Fixes: 23402bddf9e56eecb27bbd1e5467b3b79b3dbe58
Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index 891dbee..76d7070 100644 (file)
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -533,6 +533,9 @@ static int gfar_spauseparam(struct net_device *dev,
        struct gfar __iomem *regs = priv->gfargrp[0].regs;
        u32 oldadv, newadv;
 
+       if (!phydev)
+               return -ENODEV;
+
        if (!(phydev->supported & SUPPORTED_Pause) ||
            (!(phydev->supported & SUPPORTED_Asym_Pause) &&
             (epause->rx_pause != epause->tx_pause)))