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

03.07.2021 14:08, Peter Chen пишет:

On 21-07-02 02:43:10, Dmitry Osipenko wrote:

quoted

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.