linux-kernel - [PATCH] thermal/core: Fix lockdep

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Date:   Fri, 12 Aug 2022 15:12:02 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     m.szyprowski@...sung.com
Cc:     rafael@...nel.org, krzk@...nel.org, rui.zhang@...el.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        amitk@...nel.org, linux-samsung-soc@...r.kernel.org
Subject: [PATCH] thermal/core: Fix lockdep_assert() warning

The function thermal_zone_device_is_enabled() must be called with the
thermal zone lock held. In the resume path, it is called without.

As the thermal_zone_device_is_enabled() is also checked in
thermal_zone_device_update(), do the check in resume() function is
pointless, except for saving an extra initialization which does not
hurt if it is done in all the cases.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/thermal/thermal_core.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 50814009339d..dc8ff6a84df1 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1438,9 +1438,6 @@ static int thermal_pm_notify(struct notifier_block *nb,
 	case PM_POST_SUSPEND:
 		atomic_set(&in_suspend, 0);
 		list_for_each_entry(tz, &thermal_tz_list, node) {
-			if (!thermal_zone_device_is_enabled(tz))
-				continue;
-
 			thermal_zone_device_init(tz);
 			thermal_zone_device_update(tz,
 						   THERMAL_EVENT_UNSPECIFIED);
-- 
2.34.1