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

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Message-Id: <201002032252.36514.tobias.lorenz@gmx.net>
Date:	Wed, 3 Feb 2010 22:52:35 +0100
From:	Tobias Lorenz <tobias.lorenz@....net>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	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()

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.

Bye,
Toby

Am Mittwoch 03 Februar 2010 20:48:05 schrieb Roel Kluin:
> The -EINVAL was overwritten by the si470x_disconnect_check().
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Is this needed?
> 
> diff --git a/drivers/media/radio/si470x/radio-si470x-common.c b/drivers/media/radio/si470x/radio-si470x-common.c
> index 4da0f15..65b4a92 100644
> --- a/drivers/media/radio/si470x/radio-si470x-common.c
> +++ b/drivers/media/radio/si470x/radio-si470x-common.c
> @@ -748,12 +748,13 @@ static int si470x_vidioc_s_tuner(struct file *file, void *priv,
>  		struct v4l2_tuner *tuner)
>  {
>  	struct si470x_device *radio = video_drvdata(file);
> -	int retval = -EINVAL;
> +	int retval;
>  
>  	/* safety checks */
>  	retval = si470x_disconnect_check(radio);
>  	if (retval)
>  		goto done;
> +	retval = -EINVAL;
>  
>  	if (tuner->index != 0)
>  		goto done;
> 
--
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