Re: [PATCH v2 05/12] usb: otg-fsm: Fix hrtimer list corruption

From: Dmitry Osipenko
Date: Sat Jul 03 2021 - 13:22:52 EST

03.07.2021 14:08, Peter Chen пишет:
> On 21-07-02 02:43:10, Dmitry Osipenko wrote:
>> The HNP work can be re-scheduled while it's still in-fly. This results in
>> re-initialization of the busy work, resetting the hrtimer's list node of
>> the work and crashing kernel with null dereference within kernel/timer
>> once work's timer is expired. It's very easy to trigger this problem by
>> re-plugging USB cable quickly. Initialize HNP work only once to fix this
>> trouble.
> Fully OTG compliance support has not maintained for years, what's the use case you
> still want to use?

I don't have any use case for it, but I had CONFIG_USB_OTG_FSM=y and it
was crashing kernel badly. The OTG works perfectly fine without the FSM.