linux-kernel - [PATCH net 1/3] net: phy: realtek: clear 1000Base-T lpa if link is down

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Message-ID: <67e38eee4c46b921938fb33f5bc86c8979b9aa33.1736951652.git.daniel@makrotopia.org>
Date: Wed, 15 Jan 2025 14:43:35 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Daniel Golle <daniel@...rotopia.org>,
	"Russell King (Oracle)" <linux@...linux.org.uk>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net 1/3] net: phy: realtek: clear 1000Base-T lpa if link is
 down

Only read 1000Base-T link partner advertisement if autonegotiation has
completed and otherwise 1000Base-T link partner advertisement bits.

This fixes bogus 1000Base-T link partner advertisement after link goes
down (eg. by disconnecting the wire).
Fixes: 5cb409b3960e ("net: phy: realtek: clear 1000Base-T link partner advertisement")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/phy/realtek.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index f65d7f1f348e..26b324ab0f90 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -1023,23 +1023,20 @@ static int rtl822x_c45_read_status(struct phy_device *phydev)
 {
 	int ret, val;
 
-	ret = genphy_c45_read_status(phydev);
-	if (ret < 0)
-		return ret;
-
-	if (phydev->autoneg == AUTONEG_DISABLE ||
-	    !genphy_c45_aneg_done(phydev))
-		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
-
 	/* Vendor register as C45 has no standardized support for 1000BaseT */
-	if (phydev->autoneg == AUTONEG_ENABLE) {
+	if (phydev->autoneg == AUTONEG_ENABLE && genphy_c45_aneg_done(phydev)) {
 		val = phy_read_mmd(phydev, MDIO_MMD_VEND2,
 				   RTL822X_VND2_GANLPAR);
 		if (val < 0)
 			return val;
-
-		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, val);
+	} else {
+		val = 0;
 	}
+	mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, val);
+
+	ret = genphy_c45_read_status(phydev);
+	if (ret < 0)
+		return ret;
 
 	if (!phydev->link)
 		return 0;
-- 
2.47.1