linux-kernel - Re: [PATCH 2/9] input: goodix: fix variable length array warning

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Date:	Thu, 28 May 2015 17:57:53 +0200
From:	Antonio Ospite <ao2@....it>
To:	Irina Tirdea <irina.tirdea@...el.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bastien Nocera <hadess@...ess.net>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] input: goodix: fix variable length array warning

On Thu, 28 May 2015 15:47:38 +0300
Irina Tirdea <irina.tirdea@...el.com> wrote:

> Fix sparse warning:
> drivers/input/touchscreen/goodix.c:182:26: warning:
> Variable length array is used.
> 
> Replace the variable length array with fixed length.
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> ---
>  drivers/input/touchscreen/goodix.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index c2e785c..dac1b3c 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -147,7 +147,7 @@ static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
>   */
>  static void goodix_process_events(struct goodix_ts_data *ts)
>  {
> -	u8  point_data[1 + GOODIX_CONTACT_SIZE * ts->max_touch_num];
> +	u8  point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];

Hi,

this fixes the warning from sparse, but also changes the semantics of
the code: ts->max_touch_num is less that GOODIX_MAX_CONTACTS for 5
touches devices and in this case we'll end up using more memory than is
necessary.

Thanks,
   Antonio

>  	int touch_num;
>  	int i;
>  
> -- 
> 1.9.1
> 
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-- 
Antonio Ospite
http://ao2.it

A: Because it messes up the order in which people normally read text.
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