linux-kernel - Re: [PATCH v3 1/2] Input: ilitek_ts_i2c

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Message-ID: <ZqqJjyo-8dJPqXe3@google.com>
Date: Wed, 31 Jul 2024 11:59:27 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v3 1/2] Input: ilitek_ts_i2c - avoid wrong input
 subsystem sync

Hi Francesco,

On Fri, Dec 22, 2023 at 07:31:13PM +0100, Francesco Dolcini wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> 
> For different reasons i2c transaction may fail or
> report id message content may be wrong.
> Avoid sync the input subsystem if message cannot be parsed.
> An input subsystem sync without points is interpreted as
> "nothing is touching the screen" while normally this is not the case.
> 
> Fixes: 42370681bd46 ("Input: Add support for ILITEK Lego Series")
> Reviewed-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>

If you are adding your sign-off you do not need to have your
reviewed-by, it is assumed that you reviewed the code you are passing
on.

> ---
> v3: added reviewed by
> ---
>  drivers/input/touchscreen/ilitek_ts_i2c.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/ilitek_ts_i2c.c b/drivers/input/touchscreen/ilitek_ts_i2c.c
> index fc4e39b6651a..250133f0d68f 100644
> --- a/drivers/input/touchscreen/ilitek_ts_i2c.c
> +++ b/drivers/input/touchscreen/ilitek_ts_i2c.c
> @@ -203,9 +203,9 @@ static int ilitek_process_and_report_v6(struct ilitek_ts_data *ts)
>  		ilitek_touch_down(ts, id, x, y);
>  	}
>  
> -err_sync_frame:
>  	input_mt_sync_frame(input);
>  	input_sync(input);
> +err_sync_frame:

You are not syncing the frame, so that label is wrong. If you do not
want to release the contacts just change "goto err_sync_frame" to
direct returns and remove the label.

Thanks.

-- 
Dmitry