linux-kernel - Re: [PATCH] radio-si470x-common: -EINVAL overwritten in si470x_vidioc_s

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Date:	Wed, 03 Feb 2010 23:34:36 -0200
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Tobias Lorenz <tobias.lorenz@....net>
CC:	Roel Kluin <roel.kluin@...il.com>, linux-media@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] radio-si470x-common: -EINVAL overwritten in si470x_vidioc_s_tuner()

Tobias Lorenz wrote:
> Hello Roel,
> 
> no, the default value of retval makes no difference to the function.
> 
> Retval is set by si470x_disconnect_check and si470x_set_register.
> After each call, retval is checked.
> There is no need to reset it passed.
> 
> The only reason, there is a default value is my static code checker, saying variables should have default values.
> Setting it to -EINVAL seems more reasonable to me than setting it 0.
> In fact the patch would bring up the warning on setting default values again.

Well, your static code checker is then broken ;)

>>  	struct si470x_device *radio = video_drvdata(file);
>> -	int retval = -EINVAL;
>> +	int retval;
>>  
>>  	/* safety checks */
>>  	retval = si470x_disconnect_check(radio);

You may just do then:

	int retval = si470x_disconnect_check(radio);

>>  	if (retval)
>>  		goto done;
>> +	retval = -EINVAL;
>>  
>>  	if (tuner->index != 0)
>>  		goto done;
>>
> --
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-- 

Cheers,
Mauro
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