From: Andrew Halaney <ahalaney@redhat.com> stable inclusion from stable-v6.6.8 commit 58c556661641c5ecbfc064067a31729d8d2c193d category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8ST59 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit e23c0d21ce9234fbc31ece35663ababbb83f9347 ] Many hardware configurations have the MDIO bus disabled, and are instead using some other MDIO bus to talk to the MAC's phy. of_mdiobus_register() returns -ENODEV in this case. Let's handle it gracefully instead of failing to probe the MAC. Fixes: 47dd7a540b8a ("net: add support for STMicroelectronics Ethernet controllers.") Signed-off-by: Andrew Halaney <ahalaney@redhat.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20231212-b4-stmmac-handle-mdio-enodev-v2-1-600171a... Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index fa9e7e7040b9..0542cfd1817e 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -591,7 +591,11 @@ int stmmac_mdio_register(struct net_device *ndev) new_bus->parent = priv->device; err = of_mdiobus_register(new_bus, mdio_node); - if (err != 0) { + if (err == -ENODEV) { + err = 0; + dev_info(dev, "MDIO bus is disabled\n"); + goto bus_register_fail; + } else if (err) { dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); goto bus_register_fail; } -- 2.20.1