netdev - Re: [PATCH] dm9601: warn on invalid mac address

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Date:	Tue, 06 Jan 2009 11:52:35 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Peter Korsgaard <jacmet@...site.dk>
Cc:	Wu Fengguang <wfg@...ux.intel.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] dm9601: warn on invalid mac address

On Tue, 2009-01-06 at 10:18 +0100, Peter Korsgaard wrote:
> >>>>> "Wu" == Wu Fengguang <wfg@...ux.intel.com> writes:
> 
> Hi,
> 
>  Wu> Add warnings on invalid mac address to help disclose/debug problems.
>  Wu> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
>  Wu> ---
>  Wu>  drivers/net/usb/dm9601.c |   12 +++++++++++-
>  Wu>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
>  Wu> --- linux-2.6.orig/drivers/net/usb/dm9601.c
>  Wu> +++ linux-2.6/drivers/net/usb/dm9601.c
>  Wu> @@ -401,8 +401,12 @@ static int dm9601_set_mac_address(struct
>  Wu>  	struct sockaddr *addr = p;
>  Wu>  	struct usbnet *dev = netdev_priv(net);
>  
>  Wu> -	if (!is_valid_ether_addr(addr->sa_data))
>  Wu> +	if (!is_valid_ether_addr(addr->sa_data)) {
>  Wu> +		DECLARE_MAC_BUF(mac_buf);
>  Wu> +		print_mac(mac_buf, addr->sa_data);
>  Wu> +		dev_warn(&net->dev, "not setting invalid mac address %s\n", mac_buf);
> 
> This should be an error and not a warning.
> Notice that print_mac returns the string, so you can do:
> 
> dev_err(&net->dev, "... %s", print_mac(mac_buf, addr->sa_data));

print_mac() is already obsolete; use %pM in the format string instead.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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