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Message-Id: <20230527112854.2366-10-ansuelsmth@gmail.com>
Date: Sat, 27 May 2023 13:28:50 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Pavel Machek <pavel@....cz>,
Lee Jones <lee@...nel.org>,
Jonathan Corbet <corbet@....net>,
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-leds@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: [net-next PATCH v3 09/13] leds: trigger: netdev: validate configured netdev
From: Andrew Lunn <andrew@...n.ch>
The netdev which the LED should blink for is configurable in
/sys/class/led/foo/device_name. Ensure when offloading that the
configured netdev is the same as the netdev the LED is associated
with. If it is not, only perform software blinking.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
drivers/leds/trigger/ledtrig-netdev.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 8d6381415208..5b59441fc415 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -108,6 +108,24 @@ static bool supports_hw_control(struct led_classdev *led_cdev)
return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
}
+/*
+ * Validate the configured netdev is the same as the one associated with
+ * the LED driver in hw control.
+ */
+static bool validate_net_dev(struct led_classdev *led_cdev,
+ struct net_device *net_dev)
+{
+ struct device *dev = led_cdev->hw_control_get_device(led_cdev);
+ struct net_device *ndev;
+
+ if (!dev)
+ return false;
+
+ ndev = to_net_dev(dev);
+
+ return ndev == net_dev;
+}
+
static bool can_hw_control(struct led_netdev_data *trigger_data)
{
unsigned int interval = atomic_read(&trigger_data->interval);
@@ -129,9 +147,11 @@ static bool can_hw_control(struct led_netdev_data *trigger_data)
/*
* net_dev must be set with hw control, otherwise no
* blinking can be happening and there is nothing to
- * offloaded.
+ * offloaded. Additionally, for hw control to be
+ * valid, the configured netdev must be the same as
+ * netdev associated to the LED.
*/
- if (!trigger_data->net_dev)
+ if (!validate_net_dev(led_cdev, trigger_data->net_dev))
return false;
/* Check if the requested mode is supported */
--
2.39.2
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