| Message ID | 20241216104826.6946-1-marex@denx.de |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] leds: trigger: netdev: Check offload ability on interface up | expand |
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c index 4b0863db901a9..c15efe3e50780 100644 --- a/drivers/leds/trigger/ledtrig-netdev.c +++ b/drivers/leds/trigger/ledtrig-netdev.c @@ -605,6 +605,8 @@ static int netdev_trig_notify(struct notifier_block *nb, trigger_data->net_dev = NULL; break; case NETDEV_UP: + trigger_data->hw_control = can_hw_control(trigger_data); + fallthrough; case NETDEV_CHANGE: get_device_state(trigger_data); /* Refresh link_speed visibility */
The trigger_data->hw_control indicates whether the LED is controlled by HW offload, i.e. the PHY. The trigger_data->hw_control = can_hw_control() is currently called only from netdev_led_attr_store(), i.e. when writing any sysfs attribute of the netdev trigger instance associated with a PHY LED. The can_hw_control() calls validate_net_dev() which internally calls led_cdev->hw_control_get_device(), which is phy_led_hw_control_get_device() for PHY LEDs. The phy_led_hw_control_get_device() returns NULL if the PHY is not attached. At least in case of DWMAC (STM32MP, iMX8M, ...), the PHY device is attached only when the interface is brought up and is detached again when the interface is brought down. In case e.g. udev rules configure the netdev LED trigger sysfs attributes before the interface is brought up, then when the interface is brought up, the LEDs are not blinking. This is because trigger_data->hw_control = can_hw_control() was called when udev wrote the sysfs attribute files, before the interface was up, so can_hw_control() resp. validate_net_dev() returned false, and the trigger_data->hw_control = can_hw_control() was never called again to update the trigger_data->hw_control content and let the offload take over the LED blinking. Call data->hw_control = can_hw_control() from netdev_trig_notify() to update the offload capability of the LED when the UP notification arrives. This makes the LEDs blink after the interface is brought up. On STM32MP13xx with RTL8211F, it is enough to have the following udev rule in place, boot the machine with cable plugged in, and the LEDs won't work without this patch once the interface is brought up, even if they should: " ACTION=="add", SUBSYSTEM=="leds", KERNEL=="stmmac-0:01:green:wan", ATTR{trigger}="netdev", ATTR{link_10}="1", ATTR{link_100}="1", ATTR{link_1000}="1", ATTR{device_name}="end0" ACTION=="add", SUBSYSTEM=="leds", KERNEL=="stmmac-0:01:yellow:wan", ATTR{trigger}="netdev", ATTR{rx}="1", ATTR{tx}="1", ATTR{device_name}="end0" " Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Marek Vasut <marex@denx.de> --- Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Christian Marangi <ansuelsmth@gmail.com> Cc: Christophe Roullier <christophe.roullier@foss.st.com> Cc: Daniel Golle <daniel@makrotopia.org> Cc: Heiner Kallweit <hkallweit1@gmail.com> Cc: Lee Jones <lee@kernel.org> Cc: Lukasz Majewski <lukma@denx.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: kernel@dh-electronics.com Cc: linux-leds@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com Cc: netdev@vger.kernel.org --- V2: Add RB from Andrew --- drivers/leds/trigger/ledtrig-netdev.c | 2 ++ 1 file changed, 2 insertions(+)