linux-kernel - Re: [PATCH 2/3] thermal: rcar_thermal: Prevent doing work after unbind

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Message-ID: <20180928090053.GC24305@bigcity.dyn.berto.se>
Date:   Fri, 28 Sep 2018 11:00:53 +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 2/3] thermal: rcar_thermal: Prevent doing work after
 unbind

Hi Geert,

Thanks for your work.

On 2018-09-27 13:32:34 +0200, Geert Uytterhoeven wrote:
> When testing bind/unbind on r8a7791/koelsch:
> 
>     WARNING: CPU: 1 PID: 697 at lib/debugobjects.c:329 debug_print_object+0x8c/0xb4
>     ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x10
> 
> This happens if the workqueue runs after the device has been unbound.
> Fix this by cancelling any queued work during remove.
> 
> 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 | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
> index ea132e122b174757..616ba2fccf410d3b 100644
> --- a/drivers/thermal/rcar_thermal.c
> +++ b/drivers/thermal/rcar_thermal.c
> @@ -453,6 +453,7 @@ static int rcar_thermal_remove(struct platform_device *pdev)
>  
>  	rcar_thermal_for_each_priv(priv, common) {
>  		rcar_thermal_irq_disable(priv);
> +		cancel_delayed_work_sync(&priv->work);
>  		if (priv->chip->use_of_thermal)
>  			thermal_remove_hwmon_sysfs(priv->zone);
>  		else
> -- 
> 2.17.1
> 

-- 
Regards,
Niklas Söderlund