linux-kernel - [PATCH 07/11] leds: trigger: netdev: reject interval and device store for hw

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Message-Id: <20230427001541.18704-8-ansuelsmth@gmail.com>
Date:   Thu, 27 Apr 2023 02:15:37 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        Lee Jones <lee@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 07/11] leds: trigger: netdev: reject interval and device store for hw_control

Reject interval and device store with hw_control enabled. They are
currently not supported and MUST be empty with hw_control enabled.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/leds/trigger/ledtrig-netdev.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 28c4465a2584..8cd876647a27 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -124,6 +124,11 @@ static ssize_t device_name_store(struct device *dev,
 
 	mutex_lock(&trigger_data->lock);
 
+	if (trigger_data->hw_control) {
+		size = -EINVAL;
+		goto out;
+	}
+
 	if (trigger_data->net_dev) {
 		dev_put(trigger_data->net_dev);
 		trigger_data->net_dev = NULL;
@@ -145,6 +150,8 @@ static ssize_t device_name_store(struct device *dev,
 	trigger_data->last_activity = 0;
 
 	set_baseline_state(trigger_data);
+
+out:
 	mutex_unlock(&trigger_data->lock);
 
 	return size;
@@ -248,6 +255,13 @@ static ssize_t interval_store(struct device *dev,
 	unsigned long value;
 	int ret;
 
+	mutex_lock(&trigger_data->lock);
+
+	if (trigger_data->hw_control) {
+		size = -EINVAL;
+		goto out;
+	}
+
 	ret = kstrtoul(buf, 0, &value);
 	if (ret)
 		return ret;
@@ -260,6 +274,9 @@ static ssize_t interval_store(struct device *dev,
 		set_baseline_state(trigger_data);	/* resets timer */
 	}
 
+out:
+	mutex_unlock(&trigger_data->lock);
+
 	return size;
 }
 
-- 
2.39.2