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

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Date:   Thu, 27 Sep 2018 13:32:33 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     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>
Cc:     "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,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 1/3] thermal: rcar_thermal: Prevent hardware access during system suspend

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>
---
 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