linux-kernel - Re: [PATCH 2/5] HID: multitouch: fix handling of buggy reports descriptors for Dell ST2220T

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Message-ID: <alpine.LNX.2.00.1203121124370.18356@pobox.suse.cz>
Date:	Mon, 12 Mar 2012 11:25:38 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"benjamin.tissoires" <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] HID: multitouch: fix handling of buggy reports
 descriptors for Dell ST2220T

On Tue, 6 Mar 2012, benjamin.tissoires wrote:

> From: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> 
> LG multitouch panels, such as the one found in Dell ST2220T, has buggy
> reports descriptors. With the previous implementation, it was impossible
> to rely on the reports descriptors to determine how the different
> touches are emitted from the device.
> 
> This patch changes the splitting of the different touches in the report
> in a more robust way.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> ---
> 
> This one gives me warning under Ubuntu (11.10 and 12.04 at least):
> drivers/hid/hid-multitouch.c: In function 'mt_input_mapping':
> arch/x86/include/asm/bitops.h:312:8: warning: array subscript is above array bounds [-Warray-bounds]
> arch/x86/include/asm/bitops.h:312:8: warning: array subscript is above array bounds [-Warray-bounds]
> 
> I don't get any warnings under Fedora. Any help would be great.

I am not getting any with my 4.3.4 and I am not able to spot any problem 
in that function. Seems like a gcc bug to me.

-- 
Jiri Kosina
SUSE Labs
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