linux-kernel - Re: [PATCH v2] media: adv7180: Fix cppcheck warnings

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Message-ID: <16ef7746-d038-4607-8e2f-8f7cef5a8b48@xs4all.nl>
Date: Mon, 5 Feb 2024 09:36:43 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Bhavin Sharma <bhavin.sharma@...iconsignals.io>, mchehab@...nel.org,
 kieran.bingham@...asonboard.com
Cc: Lars-Peter Clausen <lars@...afoo.de>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: adv7180: Fix cppcheck warnings

Hi Bhavin,

On 02/01/2024 15:27, Bhavin Sharma wrote:
> WARNING: Missing a blank line after declarations
> 
> Signed-off-by: Bhavin Sharma <bhavin.sharma@...iconsignals.io>
> ---
>  drivers/media/i2c/adv7180.c | 27 ++++++++++++++++++---------
>  1 file changed, 18 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
> index 54134473186b..0023a546b3c9 100644
> --- a/drivers/media/i2c/adv7180.c
> +++ b/drivers/media/i2c/adv7180.c
> @@ -335,8 +335,9 @@ static u32 adv7180_status_to_v4l2(u8 status1)
>  static int __adv7180_status(struct adv7180_state *state, u32 *status,
>  			    v4l2_std_id *std)
>  {
> -	int status1 = adv7180_read(state, ADV7180_REG_STATUS1);
> +	int status1;
>  
> +	status1 = adv7180_read(state, ADV7180_REG_STATUS1);
>  	if (status1 < 0)
>  		return status1;
>  
> @@ -356,7 +357,9 @@ static inline struct adv7180_state *to_state(struct v4l2_subdev *sd)
>  static int adv7180_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
>  {
>  	struct adv7180_state *state = to_state(sd);
> -	int err = mutex_lock_interruptible(&state->mutex);
> +	int err;
> +
> +	err = mutex_lock_interruptible(&state->mutex);

The problem here is the missing empty line, not that 'int err = <something>;' part.
So just add the empty line and don't split up the variable assignment.

>  	if (err)
>  		return err;
>  
> @@ -388,8 +391,9 @@ static int adv7180_s_routing(struct v4l2_subdev *sd, u32 input,
>  			     u32 output, u32 config)
>  {
>  	struct adv7180_state *state = to_state(sd);
> -	int ret = mutex_lock_interruptible(&state->mutex);
> +	int ret;
>  
> +	ret = mutex_lock_interruptible(&state->mutex);
>  	if (ret)
>  		return ret;
>  
> @@ -399,7 +403,6 @@ static int adv7180_s_routing(struct v4l2_subdev *sd, u32 input,
>  	}
>  
>  	ret = state->chip_info->select_input(state, input);
> -

Why remove this empty line? It has nothing to do with what you are trying
to fix.

>  	if (ret == 0)
>  		state->input = input;
>  out:
> @@ -410,7 +413,9 @@ static int adv7180_s_routing(struct v4l2_subdev *sd, u32 input,
>  static int adv7180_g_input_status(struct v4l2_subdev *sd, u32 *status)
>  {
>  	struct adv7180_state *state = to_state(sd);
> -	int ret = mutex_lock_interruptible(&state->mutex);
> +	int ret;
> +
> +	ret = mutex_lock_interruptible(&state->mutex);
>  	if (ret)
>  		return ret;
>  
> @@ -436,8 +441,9 @@ static int adv7180_program_std(struct adv7180_state *state)
>  static int adv7180_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
>  {
>  	struct adv7180_state *state = to_state(sd);
> -	int ret = mutex_lock_interruptible(&state->mutex);
> +	int ret;
>  
> +	ret = mutex_lock_interruptible(&state->mutex);
>  	if (ret)
>  		return ret;
>  
> @@ -466,8 +472,9 @@ static int adv7180_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm)
>  static int adv7180_g_frame_interval(struct v4l2_subdev *sd,
>  				    struct v4l2_subdev_frame_interval *fi)
>  {
> -	struct adv7180_state *state = to_state(sd);
> +	struct adv7180_state *state;
>  
> +	state = to_state(sd);

And I am sure this never produced a cppcheck warning since there is an
empty line. If cppcheck DOES produce a warning on this, then it is a
useless application.

>  	if (state->curr_norm & V4L2_STD_525_60) {
>  		fi->interval.numerator = 1001;
>  		fi->interval.denominator = 30000;
> @@ -828,8 +835,9 @@ static int adv7180_get_mbus_config(struct v4l2_subdev *sd,
>  				   unsigned int pad,
>  				   struct v4l2_mbus_config *cfg)
>  {
> -	struct adv7180_state *state = to_state(sd);
> +	struct adv7180_state *state;
>  
> +	state = to_state(sd);
>  	if (state->chip_info->flags & ADV7180_FLAG_MIPI_CSI2) {
>  		cfg->type = V4L2_MBUS_CSI2_DPHY;
>  		cfg->bus.mipi_csi2.num_data_lanes = 1;
> @@ -857,8 +865,9 @@ static int adv7180_get_skip_frames(struct v4l2_subdev *sd, u32 *frames)
>  
>  static int adv7180_g_pixelaspect(struct v4l2_subdev *sd, struct v4l2_fract *aspect)
>  {
> -	struct adv7180_state *state = to_state(sd);
> +	struct adv7180_state *state;
>  
> +	state = to_state(sd);
>  	if (state->curr_norm & V4L2_STD_525_60) {
>  		aspect->numerator = 11;
>  		aspect->denominator = 10;

Honestly, none of these changes are worth the effort, so I just reject this.

Regards,

	Hans