linux-kernel - Re: [PATCH v2 08/16] ivtv-driver: fix handling of 'radio' module parameter

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Date:	Tue, 31 Jan 2012 14:45:25 +0100
From:	Danny Kukawka <danny.kukawka@...ect.de>
To:	Andy Walls <awalls@...metrocast.net>
Cc:	ivtv-devel@...vdriver.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, mchehab@...hat.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: Re: [PATCH v2 08/16] ivtv-driver: fix handling of 'radio' module parameter

On Dienstag, 31. Januar 2012, Andy Walls wrote:
> On Mon, 2012-01-30 at 20:40 +0100, Danny Kukawka wrote:
> > Fixed handling of 'radio' module parameter from module_param_array
> > to module_param_named to fix these compiler warnings in ivtv-driver.c:
> >
> > In function ‘__check_radio’:
> > 113:1: warning: return from incompatible pointer type [enabled by
> > default] At top level:
> > 113:1: warning: initialization from incompatible pointer type [enabled by
> > default] 113:1: warning: (near initialization for
> > ‘__param_arr_radio.num’) [enabled by default]
> >
> > Set initial state of radio_c to true instead of 1.
>
> NACK.
>
> "radio" is an array of tristate values (-1, 0, 1) per installed card:
>
> 	static int radio[IVTV_MAX_CARDS] = { -1, -1,
>
> and must remain an array or you will break the driver.
>
> Calling "radio_c" a module parameter named "radio" is wrong.
>
> The correct fix is to reverse Rusty Russel's patch to the driver in
> commit  90ab5ee94171b3e28de6bb42ee30b527014e0be7
> to change the "bool" to an "int" as it should be in
> "module_param_array(radio, ...)"

Overseen this. But wouldn't be the correct fix in this case to:
a) reverse the part of 90ab5ee94171b3e28de6bb42ee30b527014e0be7 to get:
   static unsigned int radio_c = 1;

b) change the following line:
   module_param_array(radio, bool, &radio_c, 0644);
   to:
   module_param_array(radio, int, &radio_c, 0644);

Without b) you would get a warning from the compiler again.

Danny 
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