target/linux/generic/backport-6.1/822-v6.4-net-phy-Manual-remove-LEDs-to-ensure-correct-orderin.patch

   1 From c938ab4da0eb1620ae3243b0b24c572ddfc318fc Mon Sep 17 00:00:00 2001
   2 From: Andrew Lunn <andrew@lunn.ch>
   3 Date: Sat, 17 Jun 2023 17:55:00 +0200
   4 Subject: [PATCH] net: phy: Manual remove LEDs to ensure correct ordering
   5
   6 If the core is left to remove the LEDs via devm_, it is performed too
   7 late, after the PHY driver is removed from the PHY. This results in
   8 dereferencing a NULL pointer when the LED core tries to turn the LED
   9 off before destroying the LED.
  10
  11 Manually unregister the LEDs at a safe point in phy_remove.
  12
  13 Cc: stable@vger.kernel.org
  14 Reported-by: Florian Fainelli <f.fainelli@gmail.com>
  15 Suggested-by: Florian Fainelli <f.fainelli@gmail.com>
  16 Fixes: 01e5b728e9e4 ("net: phy: Add a binding for PHY LEDs")
  17 Signed-off-by: Andrew Lunn <andrew@lunn.ch>
  18 Signed-off-by: David S. Miller <davem@davemloft.net>
  19 ---
  20  drivers/net/phy/phy_device.c | 15 ++++++++++++++-
  21  1 file changed, 14 insertions(+), 1 deletion(-)
  22
  23 --- a/drivers/net/phy/phy_device.c
  24 +++ b/drivers/net/phy/phy_device.c
  25 @@ -3070,6 +3070,15 @@ static int phy_led_blink_set(struct led_
  26         return err;
  27  }
  28
  29 +static void phy_leds_unregister(struct phy_device *phydev)
  30 +{
  31 +       struct phy_led *phyled;
  32 +
  33 +       list_for_each_entry(phyled, &phydev->leds, list) {
  34 +               led_classdev_unregister(&phyled->led_cdev);
  35 +       }
  36 +}
  37 +
  38  static int of_phy_led(struct phy_device *phydev,
  39                       struct device_node *led)
  40  {
  41 @@ -3103,7 +3112,7 @@ static int of_phy_led(struct phy_device
  42         init_data.fwnode = of_fwnode_handle(led);
  43         init_data.devname_mandatory = true;
  44
  45 -       err = devm_led_classdev_register_ext(dev, cdev, &init_data);
  46 +       err = led_classdev_register_ext(dev, cdev, &init_data);
  47         if (err)
  48                 return err;
  49
  50 @@ -3132,6 +3141,7 @@ static int of_phy_leds(struct phy_device
  51                 err = of_phy_led(phydev, led);
  52                 if (err) {
  53                         of_node_put(led);
  54 +                       phy_leds_unregister(phydev);
  55                         return err;
  56                 }
  57         }
  58 @@ -3337,6 +3347,9 @@ static int phy_remove(struct device *dev
  59
  60         cancel_delayed_work_sync(&phydev->state_queue);
  61
  62 +       if (IS_ENABLED(CONFIG_PHYLIB_LEDS))
  63 +               phy_leds_unregister(phydev);
  64 +
  65         phydev->state = PHY_DOWN;
  66
  67         sfp_bus_del_upstream(phydev->sfp_bus);