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

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Message-ID: <20200730123431.GO883641@kuha.fi.intel.com>
Date:   Thu, 30 Jul 2020 15:34:31 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, 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

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:

        static const struct sched_param param {
                .shed_priority = (MAX_USER_RT_PRIO / 2) + 1,
        };

>  	if (!dev || !tcpc ||
>  	    !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||

thanks,

-- 
heikki