linux-kernel - [PATCH 3.16 114/305] thermal: rcar_thermal: Prevent hardware access during system suspend

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Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Eduardo Valentin" <edubezval@...il.com>,
        "Niklas Söderlund" 
        <niklas.soderlund+renesas@...natech.se>
Subject: [PATCH 3.16 114/305] thermal: rcar_thermal: Prevent hardware
 access during system suspend

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert+renesas@...der.be>

commit 3a31386217628ffe2491695be2db933c25dde785 upstream.

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>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/thermal/rcar_thermal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -351,8 +351,8 @@ static irqreturn_t rcar_thermal_irq(int
 	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));
 		}
 	}