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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
 "Rafael J. Wysocki" <rafael@kernel.org>, Lukasz Luba <lukasz.luba@arm.com>,
 Daniel Lezcano <daniel.lezcano@linaro.org>
Subject:
 [PATCH v1 6/7] thermal/debugfs: Move some statements from under
 thermal_dbg->lock
Date: Thu, 09 May 2024 21:16:22 +0200
Message-ID: <8376520.T7Z3S40VBb@kreacher>
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The tz_dbg local variable assignments in thermal_debug_tz_trip_up(),
thermal_debug_tz_trip_down(), and thermal_debug_update_trip_stats()
need not be carried out under thermal_dbg->lock, so move them from
under that lock (to avoid possible future confusion).

While at it, reorder local variable definitions in
thermal_debug_tz_trip_up() for more clarity.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/thermal/thermal_debugfs.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -568,19 +568,19 @@ static struct tz_episode *thermal_debugf
 void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
 			      const struct thermal_trip *trip)
 {
-	struct tz_episode *tze;
-	struct tz_debugfs *tz_dbg;
 	struct thermal_debugfs *thermal_dbg = tz->debugfs;
 	int trip_id = thermal_zone_trip_id(tz, trip);
 	ktime_t now = ktime_get();
+	struct tz_debugfs *tz_dbg;
+	struct tz_episode *tze;
 
 	if (!thermal_dbg)
 		return;
 
-	mutex_lock(&thermal_dbg->lock);
-
 	tz_dbg = &thermal_dbg->tz_dbg;
 
+	mutex_lock(&thermal_dbg->lock);
+
 	/*
 	 * The mitigation is starting. A mitigation can contain
 	 * several episodes where each of them is related to a
@@ -667,10 +667,10 @@ void thermal_debug_tz_trip_down(struct t
 	if (!thermal_dbg)
 		return;
 
-	mutex_lock(&thermal_dbg->lock);
-
 	tz_dbg = &thermal_dbg->tz_dbg;
 
+	mutex_lock(&thermal_dbg->lock);
+
 	/*
 	 * The temperature crosses the way down but there was not
 	 * mitigation detected before. That may happen when the
@@ -719,10 +719,10 @@ void thermal_debug_update_trip_stats(str
 	if (!thermal_dbg)
 		return;
 
-	mutex_lock(&thermal_dbg->lock);
-
 	tz_dbg = &thermal_dbg->tz_dbg;
 
+	mutex_lock(&thermal_dbg->lock);
+
 	if (!tz_dbg->nr_trips)
 		goto out;