linux-kernel - Re: [PATCH 2/3] Input: Remove redundant field elantech

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Message-ID: <87fsfz7o4c.fsf@mkorpershoek-xps-13-9370.home>
Date:   Fri, 07 Oct 2022 15:35:31 +0200
From:   Mattijs Korpershoek <mkorpershoek@...libre.com>
To:     Eirin Nya <nyanpasu256@...il.com>, linux-input@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] Input: Remove redundant field elantech_data::width

On Thu, Sep 29, 2022 at 01:21, Eirin Nya <nyanpasu256@...il.com> wrote:

> elantech_data::width is copied from elantech_device_info::width, and
> neither is mutated after initialization. So remove the redundant
> variable to prevent future bugs.
>
> Signed-off-by: Eirin Nya <nyanpasu256@...il.com>

Reviewed-by: Mattijs Korpershoek <mkorpershoek@...libre.com>

ps: please consider using the proper subject line for input subsystem if
you need to send again.

It should be "Input: elantech - Remove redundant field elantech_data::width"

$ git log --oneline drivers/input/mouse/elantech.c shows:
1d72d9f960cc Input: elantech - fix stack out of bound access in elantech_change_report_id()
be896bd3b72b Input: elantench - fix misreporting trackpoint coordinates
9d383e96448d Input: elantech - Prepare a complete software node for the device

(this is a minor remark, so no need to send a v2 to just change the
subject line)

Cheers
Mattijs

> ---
>  drivers/input/mouse/elantech.c | 4 +---
>  drivers/input/mouse/elantech.h | 1 -
>  2 files changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> index 79e31611fc..263779c031 100644
> --- a/drivers/input/mouse/elantech.c
> +++ b/drivers/input/mouse/elantech.c
> @@ -691,7 +691,7 @@ static void process_packet_head_v4(struct psmouse *psmouse)
>  	input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
>  	input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
>  	input_report_abs(dev, ABS_MT_PRESSURE, pres);
> -	input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
> +	input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->info.width);
>  	/* report this for backwards compatibility */
>  	input_report_abs(dev, ABS_TOOL_WIDTH, traces);
>  
> @@ -1253,8 +1253,6 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>  		input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res);
>  	}
>  
> -	etd->width = width;
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
> index 1ec004f72d..fb093134ea 100644
> --- a/drivers/input/mouse/elantech.h
> +++ b/drivers/input/mouse/elantech.h
> @@ -180,7 +180,6 @@ struct elantech_data {
>  	unsigned char reg_25;
>  	unsigned char reg_26;
>  	unsigned int single_finger_reports;
> -	unsigned int width;
>  	struct finger_pos mt[ETP_MAX_FINGERS];
>  	unsigned char parity[256];
>  	struct elantech_device_info info;
> -- 
> 2.37.3