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

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Message-Id: <20180927113235.30354-3-geert+renesas@glider.be>
Date:   Thu, 27 Sep 2018 13:32:34 +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 2/3] thermal: rcar_thermal: Prevent doing work after unbind

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>
---
 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