linux-kernel - Re: [PATCH v2 2/8] input: goodix: fix variable length array warning

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Date:	Tue, 09 Jun 2015 17:35:44 +0200
From:	Bastien Nocera <hadess@...ess.net>
To:	Irina Tirdea <irina.tirdea@...el.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v2 2/8] input: goodix: fix variable length array warning

On Mon, 2015-06-08 at 17:37 +0300, Irina Tirdea 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.
> 
> Some Goodix devices have maximum 5 touch points, while
> others have 10 touch points. Using the maximum length
> (80 bytes) for all devices will lead to wasting 40 bytes
> when using devices with maximum 5 touch points. However,
> that is prefferable to using kmalloc which will use even
          ^^^^^^^^^^^
preferable

> more resources.
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>

Acked-by: Bastien Nocera <hadess@...ess.net>

> ---
>  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 a65e4d9..18557e4 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];
>       int touch_num;
>       int i;
>  
--
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