On Tue, 19 May 2015, Ping Cheng wrote:

We assumed all touch interfaces report touch data. But, Bamboo
and Intuos non-touch devices report express keys on touch
interface. We need to check touch_max before counting touches.

Reported-by: Tasos Sahanidis <redacted>
Signed-off-by: Ping Cheng <redacted>
---
Hi Jiri, this patch is based on for-4.1/wacom. The issue was
initially introduced in 4.1.

Thanks. This is now applied to for-4.1/upstream-fixes, and this branch 
will be sent to Linus for pulling later today.

-- 
Jiri Kosina
SUSE Labs