From 6c302b900979c3bad2a7764f72f23ccc2d2a33a4 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Thu, 1 Sep 2022 21:40:44 +0100 Subject: [PATCH] kernel: fix DSA mac_select_pcs backport Backport commit from Linux 5.18 fixing phylink with DSA drivers which do not provide mac_select_pcs yet. Fixes: aab466f422 ("kernel: backport generic phylink validate") Signed-off-by: Daniel Golle --- ...-fix-DSA-mac_select_pcs-introduction.patch | 88 +++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 target/linux/generic/backport-5.15/703-15-v5.18-net-phy-phylink-fix-DSA-mac_select_pcs-introduction.patch diff --git a/target/linux/generic/backport-5.15/703-15-v5.18-net-phy-phylink-fix-DSA-mac_select_pcs-introduction.patch b/target/linux/generic/backport-5.15/703-15-v5.18-net-phy-phylink-fix-DSA-mac_select_pcs-introduction.patch new file mode 100644 index 00000000000..4ab90fafe1d --- /dev/null +++ b/target/linux/generic/backport-5.15/703-15-v5.18-net-phy-phylink-fix-DSA-mac_select_pcs-introduction.patch @@ -0,0 +1,88 @@ +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"); +@@ -1220,6 +1227,7 @@ 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 +@@ -1017,8 +1017,8 @@ 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); -- 2.30.2