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net: phy: Manual remove LEDs to ensure correct ordering

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If the core is left to remove the LEDs via devm_, it is performed too
late, after the PHY driver is removed from the PHY. This results in
dereferencing a NULL pointer when the LED core tries to turn the LED
off before destroying the LED.

Manually unregister the LEDs at a safe point in phy_remove.

Cc: stable@vger.kernel.org
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Suggested-by: Florian Fainelli <f.fainelli@gmail.com>
Fixes: 01e5b728e9 ("net: phy: Add a binding for PHY LEDs")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2023-06-17 17:55:00 +02:00 committed by David S. Miller
parent eb09fc2d14
commit c938ab4da0
1 changed files with 14 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/net/phy/phy_device.c
View file

@ -3021,6 +3021,15 @@ static int phy_led_blink_set(struct led_classdev *led_cdev,
return err;
}
static void phy_leds_unregister(struct phy_device *phydev)
{
struct phy_led *phyled;
list_for_each_entry(phyled, &phydev->leds, list) {
led_classdev_unregister(&phyled->led_cdev);
}
}
static int of_phy_led(struct phy_device *phydev,
struct device_node *led)
{
@ -3054,7 +3063,7 @@ static int of_phy_led(struct phy_device *phydev,
init_data.fwnode = of_fwnode_handle(led);
init_data.devname_mandatory = true;
err = devm_led_classdev_register_ext(dev, cdev, &init_data);
err = led_classdev_register_ext(dev, cdev, &init_data);
if (err)
return err;
@ -3083,6 +3092,7 @@ static int of_phy_leds(struct phy_device *phydev)
err = of_phy_led(phydev, led);
if (err) {
of_node_put(led);
phy_leds_unregister(phydev);
return err;
}
}
@ -3305,6 +3315,9 @@ static int phy_remove(struct device *dev)
cancel_delayed_work_sync(&phydev->state_queue);
if (IS_ENABLED(CONFIG_PHYLIB_LEDS))
phy_leds_unregister(phydev);
phydev->state = PHY_DOWN;
sfp_bus_del_upstream(phydev->sfp_bus);