linux-kernel - Re: [PATCH 1/3] thermal: rcar_thermal: Prevent hardware access during system suspend

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Date:   Fri, 28 Sep 2018 10:51:45 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Support Opensource <support.opensource@...semi.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        linux-pm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] thermal: rcar_thermal: Prevent hardware access
 during system suspend

Hi Geert,

Thanks for your patch.

On 2018-09-27 13:32:33 +0200, Geert Uytterhoeven wrote:
> On r8a7791/koelsch, sometimes the following message is printed during
> system suspend:
> 
>     rcar_thermal e61f0000.thermal: thermal sensor was broken
> 
> This happens if the workqueue runs while the device is already
> suspended.  Fix this by using the freezable system workqueue instead,
> cfr. commit 51e20d0e3a60cf46 ("thermal: Prevent polling from happening
> during system suspend").
> 
> Fixes: e0a5172e9eec7f0d ("thermal: rcar: add interrupt support")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/thermal/rcar_thermal.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
> index 78f932822d381c9d..ea132e122b174757 100644
> --- a/drivers/thermal/rcar_thermal.c
> +++ b/drivers/thermal/rcar_thermal.c
> @@ -434,8 +434,8 @@ static irqreturn_t rcar_thermal_irq(int irq, void *data)
>  	rcar_thermal_for_each_priv(priv, common) {
>  		if (rcar_thermal_had_changed(priv, status)) {
>  			rcar_thermal_irq_disable(priv);
> -			schedule_delayed_work(&priv->work,
> -					      msecs_to_jiffies(300));
> +			queue_delayed_work(system_freezable_wq, &priv->work,
> +					   msecs_to_jiffies(300));
>  		}
>  	}
>  
> -- 
> 2.17.1
> 

-- 
Regards,
Niklas Söderlund