Re: [PATCH v1 05/12] usb: otg-fsm: Fix hrtimer list corruption

[Michał Mirosław]

On Thu, Jul 01, 2021 at 05:23:58AM +0300, 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.
[...]
> -	INIT_DELAYED_WORK(&fsm->hnp_polling_work, otg_hnp_polling_work);
> +	if (!fsm->hnp_work_inited) {
> +		INIT_DELAYED_WORK(&fsm->hnp_polling_work, otg_hnp_polling_work);
> +		fsm->hnp_work_inited = true;
> +	}
> +

Maybe you could just add an initialization function to be called by
users of otg_fsm? It seems that only chipidea driver uses this
struct currently.

Best Regards
Michał Mirosław