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Subject: Re: [PATCH v4 09/11] thermal: core: Stop polling DISABLED thermal
 devices
To:     Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Cc:     linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org,
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        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
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        Thomas Gleixner <tglx@linutronix.de>, kernel@collabora.com
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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Date:   Wed, 24 Jun 2020 12:02:19 +0200
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On 5/28/20 9:20 PM, Andrzej Pietrasiewicz wrote:
> Polling DISABLED devices is not desired, as all such "disabled" devices
> are meant to be handled by userspace. This patch introduces and uses
> should_stop_polling() to decide whether the device should be polled or not.
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> ---
>  drivers/thermal/thermal_core.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 14baf0288759..e9c0b990e4a9 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -301,13 +301,22 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
>  		cancel_delayed_work(&tz->poll_queue);
>  }
>  
> +static inline bool should_stop_polling(struct thermal_zone_device *tz)
> +{
> +	return !thermal_zone_device_is_enabled(tz);
> +}
> +
>  static void monitor_thermal_zone(struct thermal_zone_device *tz)
>  {
> +	bool stop;
> +
> +	stop = should_stop_polling(tz);
> +
>  	mutex_lock(&tz->lock);
>  
> -	if (tz->passive)
> +	if (!stop && tz->passive)
>  		thermal_zone_device_set_polling(tz, tz->passive_delay);
> -	else if (tz->polling_delay)
> +	else if (!stop && tz->polling_delay)
>  		thermal_zone_device_set_polling(tz, tz->polling_delay);
>  	else
>  		thermal_zone_device_set_polling(tz, 0);
> @@ -517,6 +526,9 @@ void thermal_zone_device_update(struct thermal_zone_device *tz,
>  {
>  	int count;
>  
> +	if (should_stop_polling(tz))
> +		return;
> +
>  	if (atomic_read(&in_suspend))
>  		return;
>  
>