linux-kernel - Re: [RFC] Input: define separate EVIOCGKEYCODE_V2/EVIOCSKEYCODE

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Date:	Thu, 9 Dec 2010 11:16:47 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Linux Input <linux-input@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-media@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>, Jarod Wilson <jarod@...hat.com>,
	David Härdeman <david@...deman.nu>
Subject: Re: [RFC] Input: define separate EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2

On Thu, Dec 09, 2010 at 08:04:36PM +0100, Henrik Rydberg wrote:
> On 12/09/2010 10:39 AM, Dmitry Torokhov wrote:
> 
> > The desire to keep old names for the EVIOCGKEYCODE/EVIOCSKEYCODE while
> > extending them to support large scancodes was a mistake. While we tried
> > to keep ABI intact (and we succeeded in doing that, programs compiled
> > on older kernels will work on newer ones) there is still a problem with
> > recompiling existing software with newer kernel headers.
> > 
> > New kernel headers will supply updated ioctl numbers and kernel will
> > expect that userspace will use struct input_keymap_entry to set and
> > retrieve keymap data. But since the names of ioctls are still the same
> > userspace will happily compile even if not adjusted to make use of the
> > new structure and will start miraculously fail in the field.
> > 
> > To avoid this issue let's revert EVIOCGKEYCODE/EVIOCSKEYCODE definitions
> > and add EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2 so that userspace can explicitly
> > select the style of ioctls it wants to employ.
> > 
> > Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
> > ---
> 
> 
> Would the header change suffice in itself?

We still need to change evdev to return -EINVAL on wrong sizes but yes,
the amount of change there could be more limited. I just thought that
splitting it up explicitly shows the differences in handling better. If
people prefer the previos version we could leave it, I am 50/50 between
them.

> Either way, also checked that the
> bugfixes following the original patch is still in effect, so looks ok to me.

Thanks.

-- 
Dmitry
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