linux-kernel - Re: [PATCH] media: i2c: hi846: Fix V4L2_SUBDEV_FORMAT_TRY get

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Date: Thu, 9 May 2024 22:39:00 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Martin Kepplinger <martink@...teo.de>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: hi846: Fix V4L2_SUBDEV_FORMAT_TRY
 get_selection()

Hi Ricardo,

Thank you for the patch.

On Thu, May 09, 2024 at 05:05:55PM +0000, Ricardo Ribalda wrote:
> The current code does not return anything to the user.
> 
> Although the code looks a bit dangerous (using a pointer without
> checking if it is valid), it should be fine. The code validates that

I think you meant s/code/core/

> sel->pad has a valid value.
> 
> Fix the following smatch error:
> drivers/media/i2c/hi846.c:1854 hi846_get_selection() warn: statement has no effect 31
> 
> Fixes: e8c0882685f9 ("media: i2c: add driver for the SK Hynix Hi-846 8M pixel camera")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

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

> ---
> While running media-ci on the last patches there was a new sparse
> warning:
> https://gitlab.freedesktop.org/linux-media/users/patchwork/-/jobs/58524338/artifacts/external_file/junit/test-smatch.log.txt
> ---
>  drivers/media/i2c/hi846.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/hi846.c b/drivers/media/i2c/hi846.c
> index 9c565ec033d4..52d9ca68a86c 100644
> --- a/drivers/media/i2c/hi846.c
> +++ b/drivers/media/i2c/hi846.c
> @@ -1851,7 +1851,7 @@ static int hi846_get_selection(struct v4l2_subdev *sd,
>  		mutex_lock(&hi846->mutex);
>  		switch (sel->which) {
>  		case V4L2_SUBDEV_FORMAT_TRY:
> -			v4l2_subdev_state_get_crop(sd_state, sel->pad);
> +			sel->r = *v4l2_subdev_state_get_crop(sd_state, sel->pad);
>  			break;
>  		case V4L2_SUBDEV_FORMAT_ACTIVE:
>  			sel->r = hi846->cur_mode->crop;
> 
> ---
> base-commit: 48259b90973718d2277db27b5e510f0fe957eaa0
> change-id: 20240509-fix-hi846-c3d77768622e

-- 
Regards,

Laurent Pinchart