linux-kernel - Re: [PATCH] power_supply: change the way how wm97xx-bat driver is registered

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Date:	Mon, 3 Nov 2008 22:34:55 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Dmitry Baryshkov <dbaryshkov@...il.com>
Cc:	linux-kernel@...r.kernel.org, cbou@...l.ru,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Vasut <marek.vasut@...il.com>,
	Jonathan Cameron <Jonathan.Cameron@...il.com>
Subject: Re: [PATCH] power_supply: change the way how wm97xx-bat driver is
	registered

On Mon, Nov 03, 2008 at 09:29:55PM +0300, Dmitry Baryshkov wrote:
> On Mon, Nov 03, 2008 at 06:11:51PM +0300, Anton Vorontsov wrote:
> > On Wed, Oct 29, 2008 at 12:04:10PM +0300, Dmitry Baryshkov wrote:
> > >  #ifdef CONFIG_BATTERY_WM97XX
> > > -void __init wm97xx_bat_set_pdata(struct wm97xx_batt_info *data);
> > > +int wm97xx_bat_set_pdata(struct wm97xx_batt_info *data);
> > >  #else
> > > -static inline void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data) {}
> > > +static inline int wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
> > > +{
> > > +	return -ENODEV;
> > > +}
> > >  #endif
> > 
> > How that supposed to work when BATTERY_WM97XX is a module?
> > #ifdef CONFIG_BATTERY_WM97XX will evaluate to false, and you'll have
> > dummy wm97xx_bat_set_pdata() that returns -ENODEV...
> 
> This won't of course fix the wm97xx driver model, but the module issue
> should be fixed. What about this patch?
[...]
> -#ifdef CONFIG_BATTERY_WM97XX
> -void __init wm97xx_bat_set_pdata(struct wm97xx_batt_info *data);
> +#if defined(CONFIG_BATTERY_WM97XX) || defined(CONFIG_BATTERY_WM97XX_MODULE)
> +int wm97xx_bat_set_pdata(struct wm97xx_batt_info *data);

In case of CONFIG_BATTERY_WM97XX_MODULE, the build will break at link
time, since wm97xx_bat_set_pdata() might be called from the built-in
code (i.e. arch/arm/mach-pxa/palmtx.c).

>  #else
> -static inline void wm97xx_bat_set_pdata(struct wm97xx_batt_info *data) {}
> +static inline int wm97xx_bat_set_pdata(struct wm97xx_batt_info *data)
> +{
> +	return -ENODEV;
> +}
>  #endif
>  
>  #endif
> -- 
> 1.5.6.5

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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