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From 72f973f292b3eaaf451ebcd3253900d41f4ef24a Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Fri, 25 Jan 2019 17:42:51 +0000
Subject: [PATCH] net: phylink: ensure inband AN works correctly
Do not update the link interface mode while the link is down to avoid
spurious link interface changes.
Always call mac_config if we have a PHY to propagate the pause mode
settings to the MAC.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
drivers/net/phy/phylink.c | 37 +++++++++++++++----------------------
1 file changed, 15 insertions(+), 22 deletions(-)
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -459,28 +459,21 @@ static void phylink_resolve(struct work_
case MLO_AN_INBAND:
phylink_get_mac_state(pl, &link_state);
- if (pl->phydev) {
- bool changed = false;
- link_state.link = link_state.link &&
- pl->phy_state.link;
+ /* If we have a phy, the "up" state is the union of
+ * both the PHY and the MAC */
+ if (pl->phydev)
+ link_state.link &= pl->phy_state.link;
- if (pl->phy_state.interface !=
- link_state.interface) {
- link_state.interface = pl->phy_state.interface;
- changed = true;
- }
+ /* Only update if the PHY link is up */
+ if (pl->phydev && pl->phy_state.link) {
+ link_state.interface = pl->phy_state.interface;
- /* Propagate the flow control from the PHY
- * to the MAC. Also propagate the interface
- * if changed.
- */
- if (pl->phy_state.link || changed) {
- link_state.pause |= pl->phy_state.pause;
- phylink_resolve_flow(pl, &link_state);
-
- phylink_mac_config(pl, &link_state);
- }
+ /* If we have a PHY, we need to update with
+ * the pause mode bits. */
+ link_state.pause |= pl->phy_state.pause;
+ phylink_resolve_flow(pl, &link_state);
+ phylink_mac_config(pl, &link_state);
}
break;
}
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