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| author | Steve Glendinning <steve.glendinning@smsc.com> | 2009-11-29 23:14:45 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-29 23:14:45 -0800 |
| commit | 6c53b1b15e222244358d3cbbefd2a13920faa352 (patch) | |
| tree | 365c523513c54ab2b4eed1ca710fa007b8f84cce /drivers/net | |
| parent | cc098dc705895f6b0109b7e8e026ac2b8ae1c0a1 (diff) | |
| download | linux-stable-6c53b1b15e222244358d3cbbefd2a13920faa352.tar.gz linux-stable-6c53b1b15e222244358d3cbbefd2a13920faa352.tar.bz2 linux-stable-6c53b1b15e222244358d3cbbefd2a13920faa352.zip | |
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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/smsc9420.c | 14 |
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); } |