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

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Message-ID: <88b53197-44ea-4949-9758-534fad5d8a71@email.android.com>
Date:	Tue, 31 Jan 2012 10:00:31 -0500
From:	Andy Walls <awalls@...metrocast.net>
To:	Danny Kukawka <danny.kukawka@...ect.de>
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

Danny Kukawka <danny.kukawka@...ect.de> wrote:

>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 

Yes both need to happen.

I mentioned b) in my original email.

Regards,
Andy
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