From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Fri, 12 Oct 2018 07:20:15 +0000 (+0200)
Subject: thermal: rcar_thermal: Prevent hardware access during system suspend
X-Git-Tag: v4.19.87~159
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3681b901e94a18e9fbe505f4c7f34536c931ce92;p=thirdparty%2Fkernel%2Fstable.git

thermal: rcar_thermal: Prevent hardware access during system suspend

[ Upstream commit 3a31386217628ffe2491695be2db933c25dde785 ]

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@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index edaa4058686b7..4dc30e7890f6c 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));
 		}
 	}