linux-kernel - Re: [PATCH 2/3] hid: 3m: Convert to MT slots

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Date:	Mon, 20 Sep 2010 22:01:57 +0200
From:	Stéphane Chatty <chatty@...c.fr>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] hid: 3m: Convert to MT slots


Le 20 sept. 10 à 21:51, Henrik Rydberg a écrit :

> On 09/20/2010 09:46 PM, Stéphane Chatty wrote:
>
>>
>> Le 28 août 10 à 16:29, Henrik Rydberg a écrit :
>>
>>>  #define MAX_SLOTS        60
>>> -#define MAX_TRKID        59
>>> +#define MAX_TRKID        USHRT_MAX
>>>
>>
>> Oops, I forgot this one: in the rest of the code, it seems to me  
>> that you use
>> your knowledge that TRACKINGID cannot be more than 59 (you use it  
>> to map the
>> tracking ID onto the slot ID). Therefore, why change TRKID to a  
>> larger value?
>
>
> There are only 60 slots available, but an infinite number of  
> tracking ids.
> Nowhere is the tracking id assumed to be bounded by anything but  
> MAX_TRKID.
>

What about this:
+			value = clamp_val(value, 0, MAX_SLOTS - 1);
  			if (md->valid) {
  				md->curid = value;
  				md->f[value].touch = md->touch;

If you had tracking IDs 59, 60 and 61 in the same frame, this would  
not work properly would it?

St.

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