From: Vladimir Oltean <vladimir.oltean@xxxxxxx> [ Upstream commit 4751d2aa321f2828d8c5d2f7ce4ed18a01e47f46 ] stmmac_mdio_register() has logic to search for PHYs on the MDIO bus and assign them IRQ lines, as well as to set priv->plat->phy_addr. If no PHY is found, the "found" variable remains set to 0 and the function errors out. After the introduction of commit f213bbe8a9d6 ("net: stmmac: Integrate it with DesignWare XPCS"), the "found" variable was immediately reused for searching for a PCS on the same MDIO bus. This can result in 2 types of potential problems (none of them seems to be seen on the only Intel system that sets has_xpcs = true, otherwise it would have been reported): 1. If a PCS is found but a PHY is not, then the code happily exits with no error. One might say "yes, but this is not possible, because of_mdiobus_register will probe a PHY for all MDIO addresses, including for the XPCS, so if an XPCS exists, then a PHY certainly exists too". Well, that is not true, see intel_mgbe_common_data(): /* Ensure mdio bus scan skips intel serdes and pcs-xpcs */ plat->mdio_bus_data->phy_mask = 1 << INTEL_MGBE_ADHOC_ADDR; plat->mdio_bus_data->phy_mask |= 1 << INTEL_MGBE_XPCS_ADDR; 2. A PHY is found but an MDIO device with the XPCS PHY ID isn't, and in that case, the error message will be "No PHY found". Confusing. Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx> Link: https://lore.kernel.org/r/20210527155959.3270478-1-olteanv@xxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 21 +++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index d64116e0543e..a4ba27bf3131 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -444,6 +444,12 @@ int stmmac_mdio_register(struct net_device *ndev) found = 1; } + if (!found && !mdio_node) { + dev_warn(dev, "No PHY found\n"); + err = -ENODEV; + goto no_phy_found; + } + /* Try to probe the XPCS by scanning all addresses. */ if (priv->hw->xpcs) { struct mdio_xpcs_args *xpcs = &priv->hw->xpcs_args; @@ -452,6 +458,7 @@ int stmmac_mdio_register(struct net_device *ndev) xpcs->bus = new_bus; + found = 0; for (addr = 0; addr < max_addr; addr++) { xpcs->addr = addr; @@ -461,13 +468,12 @@ int stmmac_mdio_register(struct net_device *ndev) break; } } - } - if (!found && !mdio_node) { - dev_warn(dev, "No PHY found\n"); - mdiobus_unregister(new_bus); - mdiobus_free(new_bus); - return -ENODEV; + if (!found && !mdio_node) { + dev_warn(dev, "No XPCS found\n"); + err = -ENODEV; + goto no_xpcs_found; + } } bus_register_done: @@ -475,6 +481,9 @@ int stmmac_mdio_register(struct net_device *ndev) return 0; +no_xpcs_found: +no_phy_found: + mdiobus_unregister(new_bus); bus_register_fail: mdiobus_free(new_bus); return err; -- 2.30.2