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6c302b9009
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 <daniel@makrotopia.org>
89 lines
3.1 KiB
Diff
89 lines
3.1 KiB
Diff
From 1054457006d4a14de4ae4132030e33d7eedaeba1 Mon Sep 17 00:00:00 2001
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From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
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Date: Mon, 21 Feb 2022 17:10:52 +0000
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Subject: [PATCH] net: phy: phylink: fix DSA mac_select_pcs() introduction
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Vladimir Oltean reports that probing on DSA drivers that aren't yet
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populating supported_interfaces now fails. Fix this by allowing
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phylink to detect whether DSA actually provides an underlying
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mac_select_pcs() implementation.
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Reported-by: Vladimir Oltean <olteanv@gmail.com>
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Fixes: bde018222c6b ("net: dsa: add support for phylink mac_select_pcs()")
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Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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Tested-by: Vladimir Oltean <olteanv@gmail.com>
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Link: https://lore.kernel.org/r/E1nMCD6-00A0wC-FG@rmk-PC.armlinux.org.uk
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/phy/phylink.c | 14 +++++++++++---
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net/dsa/port.c | 2 +-
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2 files changed, 12 insertions(+), 4 deletions(-)
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--- a/drivers/net/phy/phylink.c
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+++ b/drivers/net/phy/phylink.c
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@@ -74,6 +74,7 @@ struct phylink {
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struct work_struct resolve;
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bool mac_link_dropped;
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+ bool using_mac_select_pcs;
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struct sfp_bus *sfp_bus;
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bool sfp_may_have_phy;
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@@ -163,7 +164,7 @@ static int phylink_validate_mac_and_pcs(
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int ret;
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/* Get the PCS for this interface mode */
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- if (pl->mac_ops->mac_select_pcs) {
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+ if (pl->using_mac_select_pcs) {
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pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface);
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if (IS_ERR(pcs))
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return PTR_ERR(pcs);
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@@ -790,7 +791,7 @@ static void phylink_major_config(struct
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phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
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- if (pl->mac_ops->mac_select_pcs) {
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+ if (pl->using_mac_select_pcs) {
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pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface);
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if (IS_ERR(pcs)) {
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phylink_err(pl,
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@@ -1192,11 +1193,17 @@ struct phylink *phylink_create(struct ph
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phy_interface_t iface,
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const struct phylink_mac_ops *mac_ops)
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{
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+ bool using_mac_select_pcs = false;
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struct phylink *pl;
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int ret;
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- /* Validate the supplied configuration */
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if (mac_ops->mac_select_pcs &&
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+ mac_ops->mac_select_pcs(config, PHY_INTERFACE_MODE_NA) !=
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+ ERR_PTR(-EOPNOTSUPP))
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+ using_mac_select_pcs = true;
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+
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+ /* Validate the supplied configuration */
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+ if (using_mac_select_pcs &&
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phy_interface_empty(config->supported_interfaces)) {
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dev_err(config->dev,
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"phylink: error: empty supported_interfaces but mac_select_pcs() method present\n");
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@@ -1220,6 +1227,7 @@ struct phylink *phylink_create(struct ph
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return ERR_PTR(-EINVAL);
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}
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+ pl->using_mac_select_pcs = using_mac_select_pcs;
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pl->phy_state.interface = iface;
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pl->link_interface = iface;
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if (iface == PHY_INTERFACE_MODE_MOCA)
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--- a/net/dsa/port.c
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+++ b/net/dsa/port.c
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@@ -1017,8 +1017,8 @@ dsa_port_phylink_mac_select_pcs(struct p
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phy_interface_t interface)
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{
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struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
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+ struct phylink_pcs *pcs = ERR_PTR(-EOPNOTSUPP);
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struct dsa_switch *ds = dp->ds;
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- struct phylink_pcs *pcs = NULL;
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if (ds->ops->phylink_mac_select_pcs)
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pcs = ds->ops->phylink_mac_select_pcs(ds, dp->index, interface);
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