[PATCH 3.12 108/113] gianfar: Check if phydev present on ethtool -A

[Jiri Slaby]

From: Claudiu Manoil <claudiu.manoil@xxxxxxxxxxxxx>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 98a46d46d1bc983125b6ff9a0e831050a7011713 upstream.

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@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 drivers/net/ethernet/freescale/gianfar_ethtool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index d3d7ede27ef1..c0f7328adb13 100644
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -553,6 +553,9 @@ 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)))
-- 
2.12.0