From 1054457006d4a14de4ae4132030e33d7eedaeba1 Mon Sep 17 00:00:00 2001 From: "Russell King (Oracle)" Date: Mon, 21 Feb 2022 17:10:52 +0000 Subject: [PATCH] net: phy: phylink: fix DSA mac_select_pcs() introduction Vladimir Oltean reports that probing on DSA drivers that aren't yet populating supported_interfaces now fails. Fix this by allowing phylink to detect whether DSA actually provides an underlying mac_select_pcs() implementation. Reported-by: Vladimir Oltean Fixes: bde018222c6b ("net: dsa: add support for phylink mac_select_pcs()") Signed-off-by: Russell King (Oracle) Tested-by: Vladimir Oltean Link: https://lore.kernel.org/r/E1nMCD6-00A0wC-FG@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski --- drivers/net/phy/phylink.c | 14 +++++++++++--- net/dsa/port.c | 2 +- 2 files changed, 12 insertions(+), 4 deletions(-) --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -74,6 +74,7 @@ struct phylink { struct work_struct resolve; bool mac_link_dropped; + bool using_mac_select_pcs; struct sfp_bus *sfp_bus; bool sfp_may_have_phy; @@ -163,7 +164,7 @@ static int phylink_validate_mac_and_pcs( int ret; /* Get the PCS for this interface mode */ - if (pl->mac_ops->mac_select_pcs) { + if (pl->using_mac_select_pcs) { pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface); if (IS_ERR(pcs)) return PTR_ERR(pcs); @@ -790,7 +791,7 @@ static void phylink_major_config(struct phylink_dbg(pl, "major config %s\n", phy_modes(state->interface)); - if (pl->mac_ops->mac_select_pcs) { + if (pl->using_mac_select_pcs) { pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface); if (IS_ERR(pcs)) { phylink_err(pl, @@ -1192,11 +1193,17 @@ struct phylink *phylink_create(struct ph phy_interface_t iface, const struct phylink_mac_ops *mac_ops) { + bool using_mac_select_pcs = false; struct phylink *pl; int ret; - /* Validate the supplied configuration */ if (mac_ops->mac_select_pcs && + mac_ops->mac_select_pcs(config, PHY_INTERFACE_MODE_NA) != + ERR_PTR(-EOPNOTSUPP)) + using_mac_select_pcs = true; + + /* Validate the supplied configuration */ + if (using_mac_select_pcs && phy_interface_empty(config->supported_interfaces)) { dev_err(config->dev, "phylink: error: empty supported_interfaces but mac_select_pcs() method present\n"); @@ -1221,6 +1228,7 @@ struct phylink *phylink_create(struct ph return ERR_PTR(-EINVAL); } + pl->using_mac_select_pcs = using_mac_select_pcs; pl->phy_state.interface = iface; pl->link_interface = iface; if (iface == PHY_INTERFACE_MODE_MOCA) --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -1033,8 +1033,8 @@ dsa_port_phylink_mac_select_pcs(struct p phy_interface_t interface) { struct dsa_port *dp = container_of(config, struct dsa_port, pl_config); + struct phylink_pcs *pcs = ERR_PTR(-EOPNOTSUPP); struct dsa_switch *ds = dp->ds; - struct phylink_pcs *pcs = NULL; if (ds->ops->phylink_mac_select_pcs) pcs = ds->ops->phylink_mac_select_pcs(ds, dp->index, interface);