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net/fec_mpc52xx: Don't dereference phy_device if it is NULL 

The FEC Ethernet device isn't always attached to a phy.  Be careful
not to dereference phy_device if it is NULL.  Also eliminates an
unnecessary extra function from the ioctl path.

Reported-by: Henk Stegeman <henk.stegeman@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Grant Likely 2009-03-31 20:17:03 +00:00 committed by David S. Miller
parent d360009c10
commit 9404c82b5e
1 changed files with 12 additions and 10 deletions
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22
drivers/net/fec_mpc52xx.c
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@ -271,15 +271,6 @@ static void mpc52xx_fec_phy_stop(struct net_device *dev)
phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
}
static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
struct mii_ioctl_data *mii_data, int cmd)
{
if (!priv->phydev)
return -ENOTSUPP;
return phy_mii_ioctl(priv->phydev, mii_data, cmd);
}
static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
{
struct mpc52xx_fec __iomem *fec = priv->fec;
@ -852,12 +843,20 @@ static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
if (!priv->phydev)
return -ENODEV;
return phy_ethtool_gset(priv->phydev, cmd);
}
static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
if (!priv->phydev)
return -ENODEV;
return phy_ethtool_sset(priv->phydev, cmd);
}
@ -887,7 +886,10 @@ static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
if (!priv->phydev)
return -ENOTSUPP;
return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
}
static const struct net_device_ops mpc52xx_fec_netdev_ops = {