6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christian Marangi ansuelsmth@gmail.com
commit f50b5d74c68e551667e265123659b187a30fe3a5 upstream.
Commit c938ab4da0eb ("net: phy: Manual remove LEDs to ensure correct ordering") correctly fixed a problem with using devm_ but missed removing the LED entry from the LEDs list.
This cause kernel panic on specific scenario where the port for the PHY is torn down and up and the kmod for the PHY is removed.
On setting the port down the first time, the assosiacted LEDs are correctly unregistered. The associated kmod for the PHY is now removed. The kmod is now added again and the port is now put up, the associated LED are registered again. On putting the port down again for the second time after these step, the LED list now have 4 elements. With the first 2 already unregistered previously and the 2 new one registered again.
This cause a kernel panic as the first 2 element should have been removed.
Fix this by correctly removing the element when LED is unregistered.
Reported-by: Daniel Golle daniel@makrotopia.org Tested-by: Daniel Golle daniel@makrotopia.org Cc: stable@vger.kernel.org Fixes: c938ab4da0eb ("net: phy: Manual remove LEDs to ensure correct ordering") Signed-off-by: Christian Marangi ansuelsmth@gmail.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://patch.msgid.link/20241004182759.14032-1-ansuelsmth@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/phy_device.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -3082,10 +3082,11 @@ static __maybe_unused int phy_led_hw_is_
static void phy_leds_unregister(struct phy_device *phydev) { - struct phy_led *phyled; + struct phy_led *phyled, *tmp;
- list_for_each_entry(phyled, &phydev->leds, list) { + list_for_each_entry_safe(phyled, tmp, &phydev->leds, list) { led_classdev_unregister(&phyled->led_cdev); + list_del(&phyled->list); } }