smsc9420: prevent BUG() if ethtool is called with interface down

This patch fixes a null pointer dereference BUG() if ethtool is used on
an smsc9420 interface while it is down, because the phy_dev is only
allocated while the interface is up.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/net/smsc9420.c b/drivers/net/smsc9420.c
index b4909a2dec66..0f7909276237 100644
--- a/drivers/net/smsc9420.c
+++ b/drivers/net/smsc9420.c
@@ -252,6 +252,9 @@ static int smsc9420_ethtool_get_settings(struct net_device *dev,
 {
         struct smsc9420_pdata *pd = netdev_priv(dev);
 
+        if (!pd->phy_dev)
+                return -ENODEV;
+
         cmd->maxtxpkt = 1;
         cmd->maxrxpkt = 1;
         return phy_ethtool_gset(pd->phy_dev, cmd);
@@ -262,6 +265,9 @@ static int smsc9420_ethtool_set_settings(struct net_device *dev,
 {
         struct smsc9420_pdata *pd = netdev_priv(dev);
 
+        if (!pd->phy_dev)
+                return -ENODEV;
+
         return phy_ethtool_sset(pd->phy_dev, cmd);
 }
 
@@ -290,6 +296,10 @@ static void smsc9420_ethtool_set_msglevel(struct net_device *netdev, u32 data)
 static int smsc9420_ethtool_nway_reset(struct net_device *netdev)
 {
         struct smsc9420_pdata *pd = netdev_priv(netdev);
+
+        if (!pd->phy_dev)
+                return -ENODEV;
+
         return phy_start_aneg(pd->phy_dev);
 }
 
@@ -312,6 +322,10 @@ smsc9420_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
         for (i = 0; i < 0x100; i += (sizeof(u32)))
                 data[j++] = smsc9420_reg_read(pd, i);
 
+        // cannot read phy registers if the net device is down
+        if (!phy_dev)
+                return;
+
         for (i = 0; i <= 31; i++)
                 data[j++] = smsc9420_mii_read(phy_dev->bus, phy_dev->addr, i);
 }