netdev - [PATCH net-next 1/2] net: phy: check for aneg disabled and half duplex in phy_ethtool_set

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Date:   Sun, 10 May 2020 10:11:33 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 1/2] net: phy: check for aneg disabled and half
 duplex in phy_ethtool_set_eee

EEE requires aneg and full duplex, therefore return EPROTONOSUPPORT
if aneg is disabled or aneg resulted in a half duplex mode.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 8c22d02b4..891bb6929 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1110,6 +1110,9 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 	if (!phydev->drv)
 		return -EIO;
 
+	if (phydev->autoneg == AUTONEG_DISABLE || phydev->duplex == DUPLEX_HALF)
+		return -EPROTONOSUPPORT;
+
 	/* Get Supported EEE */
 	cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
 	if (cap < 0)
-- 
2.26.2