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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>
This commit is contained in:
Steve Glendinning 2009-11-29 23:14:45 -08:00 committed by David S. Miller
parent cc098dc705
commit 6c53b1b15e
1 changed files with 14 additions and 0 deletions
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14
drivers/net/smsc9420.c
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@ -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);
}