linux-kernel - Re: [PATCH] media: imx: imx7_mipi_csis: convert some switch cases to the default

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Date:   Tue, 1 Jun 2021 15:46:42 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     trix@...hat.com
Cc:     rmfrfs@...il.com, slongerbeam@...il.com, p.zabel@...gutronix.de,
        mchehab@...nel.org, gregkh@...uxfoundation.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: imx: imx7_mipi_csis: convert some switch cases to
 the default

Hi Tom,

Thank you for the patch.

On Mon, May 31, 2021 at 10:43:00AM -0700, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Static analysis reports this false positive
> imx7-mipi-csis.c:1027:2: warning: 4th function call argument is
>   an uninitialized value
> 
> The variable 'align' is falsely reported as uninitialized.
> Even though all the cases are covered in the
> 	switch (csis_fmt->width % 8) {
> 
> Because there is no default case, it is reported as uninialized.
> 
> Improve the switch by converting the most numerous set of cases
> to the default and silence the false positive.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index d573f3475d28..330f283030ec 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -1016,10 +1016,8 @@ static int mipi_csis_set_fmt(struct v4l2_subdev *sd,
>  	case 6:
>  		align = 2;
>  		break;
> -	case 1:
> -	case 3:
> -	case 5:
> -	case 7:
> +	default:
> +		/* 1, 3, 5, 7 */
>  		align = 3;
>  		break;
>  	}

-- 
Regards,

Laurent Pinchart