linux-kernel - Re: [PATCH] Input: Do not add SYN_REPORT in between a single packet data

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Message-ID: <CAKdAkRQT0R6peS8iO8PhQ4YoPMowt6voZJez4EubK7R0ZV_m4Q@mail.gmail.com>
Date:	Wed, 9 Mar 2016 11:07:53 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Aniroop Mathur <a.mathur@...sung.com>,
	Henrik Rydberg <rydberg@...math.org>
Cc:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Aniroop Mathur <aniroop.mathur@...il.com>
Subject: Re: [PATCH] Input: Do not add SYN_REPORT in between a single packet data

On Mon, Mar 7, 2016 at 9:44 AM, Aniroop Mathur <a.mathur@...sung.com> wrote:
> As mentioned in documentation, SYN_REPORT should be used to separate two packets
> and should not be inserted in between a single packet as otherwise with multiple
> SYN_REPORT in a single packet, input reader would not be able to know when the
> packet ended really.
>
> Documentation snippet:
> * SYN_REPORT:
>   - Used to synchronize and separate events into packets of input data changes
>     occurring at the same moment in time. For example, motion of a mouse may set
>     the REL_X and REL_Y values for one motion, then emit a SYN_REPORT. The next
>     motion will emit more REL_X and REL_Y values and send another SYN_REPORT.
>
> Signed-off-by: Aniroop Mathur <a.mathur@...sung.com>
> ---
>  drivers/input/input.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/input/input.c b/drivers/input/input.c
> index 8806059..262ef77 100644
> --- a/drivers/input/input.c
> +++ b/drivers/input/input.c
> @@ -401,8 +401,7 @@ static void input_handle_event(struct input_dev *dev,
>                 if (dev->num_vals >= 2)
>                         input_pass_values(dev, dev->vals, dev->num_vals);
>                 dev->num_vals = 0;
> -       } else if (dev->num_vals >= dev->max_vals - 2) {
> -               dev->vals[dev->num_vals++] = input_value_sync;
> +       } else if (dev->num_vals >= dev->max_vals - 1) {
>                 input_pass_values(dev, dev->vals, dev->num_vals);
>                 dev->num_vals = 0;
>         }

This makes sense to me. Henrik?

-- 
Dmitry