Re: [PATCH v7 09/11] thermal: core: Stop polling DISABLED thermal devices

Amit Kucheria
2020-06-29T21:46:55Z

On Mon, Jun 29, 2020 at 6:00 PM Andrzej Pietrasiewicz
<andrzej.p@collabora.com> 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>

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>

> ---
> 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 52d136780577..e613f5c07bad 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;
>
> --
> 2.17.1
>