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

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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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