[PATCH] usb_kbd: fix overpolling of keyboard

[Aleksey Kuleshov]

>>  - use async callings to call poll function
>>  - remove unused
>>  - remove unnecessary locking
>
> The changes look ok, but could you split them up by logical changes?

Okay, no problem, will send ASAP.

> This patch does not solve the problem with the double return key
> detected, right?

Yes, it just fixes the way of interacting with USB keyboard by using periodic
(per several milliseconds) polling.