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Date:   Thu, 2 Nov 2023 15:55:39 +0100
From:   Jacopo Mondi <jacopo.mondi@ideasonboard.com>
To:     Alexandra Diupina <adiupina@astralinux.ru>
Cc:     Jacopo Mondi <jacopo+renesas@jmondi.org>,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        Niklas =?utf-8?Q?S=C3=B6derlund?= 
        <niklas.soderlund+renesas@ragnatech.se>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Hans de Goede <hdegoede@redhat.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andy Shevchenko <andy@kernel.org>,
        Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>, Rob Herring <robh@kernel.org>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-staging@lists.linux.dev, lvc-project@linuxtesting.org
Subject: Re: [PATCH 2/4] Remove redundant return value check
Message-ID: <g4btjscnffrzhip2lys7wezk5acebho44g6kawc5fc5p47pqxs@4lch6fjqesec>
References: <20231102141135.369-1-adiupina@astralinux.ru>
 <20231102141135.369-2-adiupina@astralinux.ru>
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In-Reply-To: <20231102141135.369-2-adiupina@astralinux.ru>
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Hi Alexandra

On Thu, Nov 02, 2023 at 05:11:33PM +0300, Alexandra Diupina wrote:
> media_entity_pads_init() will not return 0 only if the
> 2nd parameter >= MEDIA_ENTITY_MAX_PADS (512), but 1 is
> passed, so checking the return value is redundant

I do also see

          if (hweight32(iter->flags & (MEDIA_PAD_FL_SINK |
                                       MEDIA_PAD_FL_SOURCE)) != 1) {
                  ret = -EINVAL;
                  break;
          }

as a possible failure in in media_entity_pads_init().

>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: 34009bffc1c6 ("media: i2c: Add RDACM20 driver")

And this does not really qualify as a fix imho

In general, being defensive and check for return errors in not a bad
thing. I would keep the check in place, it really doesn't hurt.

Same for the other patches in the series.

Thanks
  j

> Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
> ---
>  drivers/media/i2c/rdacm20.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index f4e2e2f3972a..ed249ade54e0 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -611,9 +611,7 @@ static int rdacm20_probe(struct i2c_client *client)
>
>  	dev->pad.flags = MEDIA_PAD_FL_SOURCE;
>  	dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> -	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
> -	if (ret < 0)
> -		goto error_free_ctrls;
> +	media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
>
>  	ret = v4l2_async_register_subdev(&dev->sd);
>  	if (ret)
> --
> 2.30.2
>