linux-kernel - Re: [PATCH v2] Input - mt: Fix input_mt_get_slot_by

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Message-ID: <5539279F.4050400@bitmath.org>
Date:	Thu, 23 Apr 2015 19:10:55 +0200
From:	Henrik Rydberg <rydberg@...math.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>
CC:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Input - mt: Fix input_mt_get_slot_by_key

> "Creation, replacement and destruction of contacts is achieved by
> modifying the ABS_MT_TRACKING_ID of the associated slot.  A
> non-negative tracking id is interpreted as a contact, and the value -1
> denotes an unused slot.  A tracking id not previously present is
> considered new, and a tracking id no longer present is considered
> removed."
> 
> If some userspace is confused with missing -1 tracking ID for that
> slot, that userspace should be fixed.

I agree. Some userland applications work with add/remove out of convenience, and
cannot handle the more compressed notation the kernel slot handling allows.
Fixing those applications will be a good thing.

Unfortunately the patch already appeared in Linus' tree...

Henrik

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