netdev - Re: [PATCH] phylib: phy_ethtool_{sset,gset} -- check phydev for NULL

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Date:	Thu, 10 May 2007 10:56:13 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	matvejchikov@...il.com
Cc:	netdev@...r.kernel.org, jeff@...zik.org
Subject: Re: [PATCH] phylib: phy_ethtool_{sset,gset} -- check phydev for
 NULL

On Thu, 10 May 2007 21:29:51 +0400 Matvejchikov Ilya wrote:

> Good Day!
> 
> The command 'brctl addbr br0 eth0' brings the kernel oops if the eth0
> has PHY, but the phydev is NULL (for ex., ifconfig eth0 0.0.0.0 was
> not issued firstly)
> 
> Call Trace:
> [C02CFBD0] [7FFFFFFF] 0x7fffffff (unreliable)
> [C02CFBE0] [C0109634] dev_ethtool+0x1b0/0xfac
> [C02CFCD0] [C0155EF0] port_cost+0x5c/0x130
> [C02CFD40] [C01561FC] br_add_if+0x17c/0x308
> [C02CFD70] [C01569E0] add_del_if+0x70/0xa0
> [C02CFD90] [C0156A58] br_dev_ioctl+0x48/0x9fc
> [C02CFE10] [C0106FCC] dev_ifsioc+0x144/0x3ac
> [C02CFE30] [C01080D8] dev_ioctl+0x3b8/0x4c8
> [C02CFEB0] [C00F9BC0] sock_ioctl+0x78/0x260
> [C02CFED0] [C006889C] do_ioctl+0x38/0x84
> [C02CFEE0] [C006896C] vfs_ioctl+0x84/0x3d8
> [C02CFF10] [C0068D00] sys_ioctl+0x40/0x74
> [C02CFF40] [C000EF48] ret_from_syscall+0x0/0x38
> 
> The following patch fixes the problem.
> 
> Signed-off-by: Matvejchikov Ilya <matvejchikov <at> gmail.com>

Don't obfuscate the email address.

> ---
> 
> diff -purN linux-2.6.21-clean/drivers/net/phy/phy.c
> linux-2.6.21/drivers/net/phy/phy.c
> --- linux-2.6.21-clean/drivers/net/phy/phy.c    2007-04-26
> 07:08:32.000000000 +0400
> +++ linux-2.6.21/drivers/net/phy/phy.c  2007-05-04 08:22:01.000000000 +0400
> @@ -245,6 +245,9 @@ EXPORT_SYMBOL(phy_sanitize_settings);
>  */
>  int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
>  {
> +       if (unlikely(NULL == phydev))
> +               return -EINVAL;

Use tabs instead of spaces for indentation.

and I hope that Jeff prefers (as some others do):

	if (unlikely(phydev == NULL))

or even

	if (unlikely(!phydev))


> +
>        if (cmd->phy_address != phydev->addr)
>                return -EINVAL;
> 
> @@ -289,6 +292,9 @@ EXPORT_SYMBOL(phy_ethtool_sset);
> 
>  int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
>  {
> +       if (unlikely(NULL == phydev))
> +               return -EINVAL;
> +
>        cmd->supported = phydev->supported;
> 
>        cmd->advertising = phydev->advertising;
> -



---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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