linux-kernel - Re: [PATCH v4] usb: typec: tcpm: Migrate workqueue to RT priority for processing events

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Date:   Thu, 30 Jul 2020 23:59:08 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v4] usb: typec: tcpm: Migrate workqueue to RT priority for
 processing events

Thanks for catching that !!

On Thu, Jul 30, 2020 at 9:05 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 7/30/20 5:34 AM, Heikki Krogerus wrote:
> > Hi,
> >
> > One more nitpick below...
> >
> > On Thu, Jul 30, 2020 at 12:25:31AM -0700, Badhri Jagan Sridharan wrote:
> >> @@ -4786,10 +4807,28 @@ static int devm_tcpm_psy_register(struct tcpm_port *port)
> >>      return PTR_ERR_OR_ZERO(port->psy);
> >>  }
> >>
> >> +static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
> >> +{
> >> +    struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
> >> +
> >> +    kthread_queue_work(port->wq, &port->state_machine);
> >> +    return HRTIMER_NORESTART;
> >> +}
> >> +
> >> +static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
> >> +{
> >> +    struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
> >> +
> >> +    kthread_queue_work(port->wq, &port->vdm_state_machine);
> >> +    return HRTIMER_NORESTART;
> >> +}
> >> +
> >>  struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
> >>  {
> >>      struct tcpm_port *port;
> >>      int err;
> >> +    /* Priority just lower than default irq thread priority */
> >> +    struct sched_param param = {.sched_priority = (MAX_USER_RT_PRIO / 2) + 1,};
> >
> > Move that outside the function and constify it:
> >
>
> Good catch. With this change applied:
>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
>
> >         static const struct sched_param param {
> >                 .shed_priority = (MAX_USER_RT_PRIO / 2) + 1,
>
> Caution: s/shed/sched/
>
> >         };
> >
> >>      if (!dev || !tcpc ||
> >>          !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
> >
> > thanks,
> >
>