[PATCH 3/3] dix: allow for button-only input devices (#21457)

[Peter Hutterer]

On Thu, Dec 09, 2010 at 03:59:59PM +0000, Daniel Stone wrote:
> On Wed, Dec 08, 2010 at 02:58:49PM +1000, Peter Hutterer wrote:
> > Add a few checks for the existence of a valuator class on the device to
> > avoid null-pointer dereferences for button events from devices without a
> > valuator class.
> > 
> > X.Org Bug 21457 <http://bugs.freedesktop.org/show_bug.cgi?id=21457>
> > 
> > Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
> 
> I think you need to update clipAxis() as well, plus a couple more
> branches in positionSprite (under the 'Crossed screen? Scale back to
> device coordinates'), but with those done:

I'm not sure if we can cross the screen without having valuator movement,
but this code doesn't always obey the time-space continuum, so who knows.
I'll add the two checks, if anything they won't hurt, thanks.

Cheers,
  Peter

> Reviewed-by (for the series): Daniel Stone <daniel at fooishbar.org>