linux-kernel - [RFC PATCH v6 07/11] leds: trigger: netdev: use mutex instead of spinlocks

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Message-Id: <20220503151633.18760-8-ansuelsmth@gmail.com>
Date:   Tue,  3 May 2022 17:16:29 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        Ansuel Smith <ansuelsmth@...il.com>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-leds@...r.kernel.org
Subject: [RFC PATCH v6 07/11] leds: trigger: netdev: use mutex instead of spinlocks

Some LEDs may require to sleep to apply their hardware rules. Convert to
mutex lock to fix warning for sleeping unser spinlock softirq.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/leds/trigger/ledtrig-netdev.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index ed019cb5867c..a471e0cde836 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -20,7 +20,7 @@
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/timer.h>
 #include "../leds.h"
 
@@ -38,7 +38,7 @@
 
 struct led_netdev_data {
 	enum led_blink_modes blink_mode;
-	spinlock_t lock;
+	struct mutex lock;
 
 	struct delayed_work work;
 	struct notifier_block notifier;
@@ -183,9 +183,9 @@ static ssize_t device_name_show(struct device *dev,
 	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
 	ssize_t len;
 
-	spin_lock_bh(&trigger_data->lock);
+	mutex_lock(&trigger_data->lock);
 	len = sprintf(buf, "%s\n", trigger_data->device_name);
-	spin_unlock_bh(&trigger_data->lock);
+	mutex_unlock(&trigger_data->lock);
 
 	return len;
 }
@@ -206,7 +206,7 @@ static ssize_t device_name_store(struct device *dev,
 
 	cancel_delayed_work_sync(&trigger_data->work);
 
-	spin_lock_bh(&trigger_data->lock);
+	mutex_lock(&trigger_data->lock);
 
 	if (trigger_data->net_dev) {
 		dev_put(trigger_data->net_dev);
@@ -231,7 +231,7 @@ static ssize_t device_name_store(struct device *dev,
 		trigger_data->net_dev = old_net;
 		memcpy(trigger_data->device_name, old_device_name, IFNAMSIZ);
 
-		spin_unlock_bh(&trigger_data->lock);
+		mutex_unlock(&trigger_data->lock);
 		return -EINVAL;
 	}
 
@@ -242,7 +242,7 @@ static ssize_t device_name_store(struct device *dev,
 	trigger_data->last_activity = 0;
 
 	set_baseline_state(trigger_data);
-	spin_unlock_bh(&trigger_data->lock);
+	mutex_unlock(&trigger_data->lock);
 
 	return size;
 }
@@ -400,7 +400,7 @@ static int netdev_trig_notify(struct notifier_block *nb,
 
 	cancel_delayed_work_sync(&trigger_data->work);
 
-	spin_lock_bh(&trigger_data->lock);
+	mutex_lock(&trigger_data->lock);
 
 	trigger_data->carrier_link_up = false;
 	switch (evt) {
@@ -423,7 +423,7 @@ static int netdev_trig_notify(struct notifier_block *nb,
 
 	set_baseline_state(trigger_data);
 
-	spin_unlock_bh(&trigger_data->lock);
+	mutex_unlock(&trigger_data->lock);
 
 	return NOTIFY_DONE;
 }
@@ -484,7 +484,7 @@ static int netdev_trig_activate(struct led_classdev *led_cdev)
 	if (!trigger_data)
 		return -ENOMEM;
 
-	spin_lock_init(&trigger_data->lock);
+	mutex_init(&trigger_data->lock);
 
 	trigger_data->notifier.notifier_call = netdev_trig_notify;
 	trigger_data->notifier.priority = 10;
-- 
2.34.1