On Fri, 24 Feb 2017, Roderick Colenbrander wrote:

From: Roderick Colenbrander <roderick.colenbrander@sony.com>

When a user connects a DS4 twice using USB and BT, we reject the
second device connection after the setup work. We then perform
a cleanup, but during cleanup we are not removing the touchpad
device. This leads to leakage of an input device, which we would
never remove. It can likely result into a kernel oops as well
when the touchpad evdev node is accessed and the underlaying HID
device has been removed from the system.

Fixes: ac797b95f532 ("HID: sony: Make the DS4 touchpad a separate device")
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>

I've added -stable anotation and applied to for-4.11/upstream-fixes. 
Thanks,

-- 
Jiri Kosina
SUSE Labs