From: Florian Fainelli florian.fainelli@broadcom.com
commit 1b5ea7ffb7a3bdfffb4b7f40ce0d20a3372ee405 upstream.
With support for Ethernet PHY LEDs having been added, while unregistering a MDIO bus and its child device liks PHYs there may be "late" accesses to the MDIO bus. One typical use case is setting the PHY LEDs brightness to OFF for instance.
We need to ensure that the MDIO bus controller remains entirely functional since it runs off the main GENET adapter clock.
Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20230617155500.4005881-1-andrew@lunn.ch/ Fixes: 9a4e79697009 ("net: bcmgenet: utilize generic Broadcom UniMAC MDIO controller driver") Signed-off-by: Florian Fainelli florian.fainelli@broadcom.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://lore.kernel.org/r/20230622103107.1760280-1-florian.fainelli@broadcom... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -664,5 +664,7 @@ void bcmgenet_mii_exit(struct net_device if (of_phy_is_fixed_link(dn)) of_phy_deregister_fixed_link(dn); of_node_put(priv->phy_dn); + clk_prepare_enable(priv->clk); platform_device_unregister(priv->mii_pdev); + clk_disable_unprepare(priv->clk); }