netdev - Re: [PATCH] of_net.h: Provide dummy functions if OF

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Date:	Mon, 01 Apr 2013 13:44:24 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Rob Herring <rob.herring@...xeda.com>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH] of_net.h: Provide dummy functions if OF_NET is not configured

On 04/01/2013 01:19 PM, Guenter Roeck wrote:
> of_get_mac_address() and of_get_phy_mode() are only provided if OF_NET
> is configured. While most callers check for the define, not all do, and those
> who do require #ifdef around the code. For those who don't, the missing check
> can result in errors such as

How about removing the ifdef from those callers?

Rob

> 
> arch/powerpc/sysdev/tsi108_dev.c:107:3: error: implicit declaration of
> 	function 'of_get_mac_address' [-Werror=implicit-function-declaration]
> arch/powerpc/sysdev/mv64x60_dev.c:253:2: error: implicit declaration of
> 	function 'of_get_mac_address' [-Werror=implicit-function-declaration]
> 
> Provide dummy function declarations if OF_NET is not configured. This is safe
> because all callers do check the return values. If desired, at least some of
> the #ifdefs in the code can subsequently be removed.
> 
> Cc: David Daney <david.daney@...ium.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  include/linux/of_net.h |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/of_net.h b/include/linux/of_net.h
> index f474641..61bf53b 100644
> --- a/include/linux/of_net.h
> +++ b/include/linux/of_net.h
> @@ -11,6 +11,16 @@
>  #include <linux/of.h>
>  extern const int of_get_phy_mode(struct device_node *np);
>  extern const void *of_get_mac_address(struct device_node *np);
> +#else
> +static inline const int of_get_phy_mode(struct device_node *np)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline const void *of_get_mac_address(struct device_node *np)
> +{
> +	return NULL;
> +}
>  #endif
>  
>  #endif /* __LINUX_OF_NET_H */
> 

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