linux-kernel - [PATCH] net: phy: at803x: disable WOL at probe

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Date:   Wed, 25 May 2022 13:36:57 +0300
From:   "Viorel Suman (OSS)" <viorel.suman@....nxp.com>
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>, Luo Jie <luoj@...eaurora.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linux-imx@....com, Viorel Suman <viorel.suman@....com>
Subject: [PATCH] net: phy: at803x: disable WOL at probe

From: Viorel Suman <viorel.suman@....com>

Before 7beecaf7d507b ("net: phy: at803x: improve the WOL feature") patch
"at803x_get_wol" implementation used AT803X_INTR_ENABLE_WOL value to set
WAKE_MAGIC flag, and now AT803X_WOL_EN value is used for the same purpose.
The problem here is that the value of these two bits is different after
hardware reset: AT803X_INTR_ENABLE_WOL=0 after hardware reset, but
AT803X_WOL_EN=1. So now, if called right after boot, "at803x_get_wol" will
set WAKE_MAGIC flag, even if WOL function is not enabled via
"at803x_set_wol" call. The patch disables WOL function on probe using
"at803x_set_wol" call thus the behavior is consistent.

Fixes: 7beecaf7d507b ("net: phy: at803x: improve the WOL feature")
Signed-off-by: Viorel Suman <viorel.suman@....com>
---
 drivers/net/phy/at803x.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 73926006d319..6277d1b1d814 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -443,10 +443,10 @@ static int at803x_set_wol(struct phy_device *phydev,
 		AT803X_LOC_MAC_ADDR_0_15_OFFSET,
 	};
 
-	if (!ndev)
-		return -ENODEV;
-
 	if (wol->wolopts & WAKE_MAGIC) {
+		if (!ndev)
+			return -ENODEV;
+
 		mac = (const u8 *) ndev->dev_addr;
 
 		if (!is_valid_ether_addr(mac))
@@ -857,6 +857,9 @@ static int at803x_probe(struct phy_device *phydev)
 	if (phydev->drv->phy_id == ATH8031_PHY_ID) {
 		int ccr = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
 		int mode_cfg;
+		struct ethtool_wolinfo wol = {
+			.wolopts = 0,
+		};
 
 		if (ccr < 0)
 			goto err;
@@ -872,6 +875,13 @@ static int at803x_probe(struct phy_device *phydev)
 			priv->is_fiber = true;
 			break;
 		}
+
+		/* Disable WOL by default */
+		ret = at803x_set_wol(phydev, &wol);
+		if (ret < 0) {
+			phydev_err(phydev, "failed to disable WOL on probe: %d\n", ret);
+			return ret;
+		}
 	}
 
 	return 0;
-- 
2.35.3