netdev - [PATCH net-next 7/8] net: phy: realtek: check validity of 10GbE link-partner advertisement

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Date: Thu, 11 May 2023 00:59:46 +0200
From: Daniel Golle <daniel@...rotopia.org>
To: netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	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>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: [PATCH net-next 7/8] net: phy: realtek: check validity of 10GbE
 link-partner advertisement

Only use link-partner advertisement bits for 10GbE modes if they are
actually valid. Check LOCALOK and REMOTEOK bits and clear 10GbE modes
unless both of them are set.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/phy/realtek.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index cde61a30ac4c..29168f98f451 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -715,6 +715,10 @@ static int rtl822x_read_status(struct phy_device *phydev)
 		if (lpadv < 0)
 			return lpadv;
 
+		if (!(lpadv & MDIO_AN_10GBT_STAT_REMOK) ||
+		    !(lpadv & MDIO_AN_10GBT_STAT_LOCOK))
+			lpadv = 0;
+
 		mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, lpadv);
 	}
 
-- 
2.40.0