linux-kernel - [PATCH AUTOSEL 4.18 072/126] thermal: rcar_thermal: Prevent doing work after unbind

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Message-Id: <20181031230754.29029-72-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:07:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Eduardo Valentin <edubezval@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 072/126] thermal: rcar_thermal: Prevent doing work after unbind

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

[ Upstream commit 697ee786f15d7b65c7f3045d45fe3a05d28e0911 ]

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>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 e77e63070e99..5844e26bd372 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -465,6 +465,7 @@ 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