linux-kernel - Re: [PATCH 1/4] Remove redundant return value check

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Message-ID: <11e6e0bd-eab1-4aa7-8c5c-29de6cff1b3d@kadam.mountain>
Date:   Thu, 2 Nov 2023 17:35:09 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Alexandra Diupina <adiupina@...ralinux.ru>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH 1/4] Remove redundant return value check

On Thu, Nov 02, 2023 at 05:11:32PM +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
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: ad85094b293e ("Revert "media: staging: atomisp: Remove driver"")
> Signed-off-by: Alexandra Diupina <adiupina@...ralinux.ru>
> ---
>  drivers/staging/media/atomisp/i2c/atomisp-gc2235.c        | 4 +---
>  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c       | 6 +-----
>  drivers/staging/media/atomisp/i2c/atomisp-ov2722.c        | 2 --
>  drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c | 2 --
>  4 files changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
> index 9fa390fbc5f3..f10931a03285 100644
> --- a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
> +++ b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
> @@ -840,9 +840,7 @@ static int gc2235_probe(struct i2c_client *client)
>  	dev->ctrl_handler.lock = &dev->input_lock;
>  	dev->sd.ctrl_handler = &dev->ctrl_handler;
>  
> -	ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
> -	if (ret)
> -		gc2235_remove(client);

Not related to your patch but why doesn't this error path return an
error?  Can that be right?

> +	media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
>  
>  	return atomisp_register_i2c_module(&dev->sd, gcpdev, RAW_CAMERA);

regards,
dan carpenter