linux-kernel - Re: [PATCH][next] media: i2c: imx334: Fix a read of the uninitialized variable ret

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Date:   Wed, 10 Feb 2021 23:03:03 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "Paul J . Murphy" <paul.j.murphy@...el.com>,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Martina Krasteva <martinax.krasteva@...el.com>,
        Gjorgji Rosikopulos <gjorgjix.rosikopulos@...el.com>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: i2c: imx334: Fix a read of the
 uninitialized variable ret

Hi Colin,

On Wed, Feb 10, 2021 at 07:07:52PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently there is a dev_err error message that is printing the
> error status in variable ret (that has not been set) instead of
> the correct error status from imx334->reset_gpio.  Fix this.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 9746b11715c3 ("media: i2c: Add imx334 camera sensor driver")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/media/i2c/imx334.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> index 07e31bc2ef18..f8b1caf26c9b 100644
> --- a/drivers/media/i2c/imx334.c
> +++ b/drivers/media/i2c/imx334.c
> @@ -790,7 +790,8 @@ static int imx334_parse_hw_config(struct imx334 *imx334)
>  	imx334->reset_gpio = devm_gpiod_get_optional(imx334->dev, "reset",
>  						     GPIOD_OUT_LOW);
>  	if (IS_ERR(imx334->reset_gpio)) {
> -		dev_err(imx334->dev, "failed to get reset gpio %d", ret);
> +		dev_err(imx334->dev, "failed to get reset gpio %ld",
> +			IS_ERR_VALUE(imx334->reset_gpio));
>  		return PTR_ERR(imx334->reset_gpio);
>  	}

Thanks for the patch. This has been already addressed by another patch
here, and has just been applied to linux-media master.

commit c702e2f70275dbc5373aef50c450cf9c5730636c
Author: Hans Verkuil <hverkuil@...all.nl>
Date:   Mon Feb 8 12:32:29 2021 +0100

    media: imx334: 'ret' is uninitialized, should have been PTR_ERR()
    
    Fix this compiler warning:
    
    drivers/media/i2c/imx334.c: In function 'imx334_parse_hw_config':
    include/linux/dev_printk.h:112:2: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
      112 |  _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
          |  ^~~~~~~~
    drivers/media/i2c/imx334.c:783:6: note: 'ret' was declared here
      783 |  int ret;
          |      ^~~
    
    Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
    Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

-- 
Kind regards,

Sakari Ailus