linux-kernel - Re: [PATCH 1/1] integer overflow issue in 'appletouch' driver

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Message-ID: <1281196050.4431.4.camel@jlt3.sipsolutions.net>
Date:	Sat, 07 Aug 2010 17:47:30 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
Cc:	Vadim Zaliva <lord@...codile.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 1/1] integer overflow issue in 'appletouch' driver

On Sat, 2010-08-07 at 14:00 +0000, Serge Belyshev wrote:
> Hi!
> 
> Since 2.6.34 the touchpad on my feb 2005 powerbook (mod. A1106) has
> stopped working. I've identified the following guilty patch:
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=04b4b88cca0ebe3813b4b6f014fb6a0db380b137
> 
> > ... Testing on one of such PowerBooks I have
> > noticed that touchpad always generates positive values, but some of
> > them are greater that 127, and thus, when cast to 'signed char' being
> > interpreted as a negative.
> 
> My device is 05ac:020e "fountain", actually generates *signed* values,
> thus the patch completely breaks it.

I think Ben might have the same issue. I guess we need per-touchpad
functions to read the data.

johannes


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