linux-kernel - [PATCH net V2 2/2] net: lan743x: support WOL in MAC even when PHY does not

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Message-ID: <20240320042107.903051-3-Raju.Lakkaraju@microchip.com>
Date: Wed, 20 Mar 2024 09:51:07 +0530
From: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<edumazet@...gle.com>, <linux-kernel@...r.kernel.org>,
	<bryan.whitehead@...rochip.com>, <UNGLinuxDriver@...rochip.com>
Subject: [PATCH net V2 2/2] net: lan743x: support WOL in MAC even when PHY does not

Allow WOL support if MAC supports it, even if the PHY does not support it

Fixes: e9e13b6adc338 ("lan743x: fix for potential NULL pointer dereference with bare card")
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
---
Change List:
------------
V1 -> V2:
  - Repost - No change
V0 -> V1:
  - Change the "phy does not support WOL" print from netif_info() to
    netif_dbg()

 drivers/net/ethernet/microchip/lan743x_ethtool.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index 8a6ae171e375..7509a19269c3 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -1163,6 +1163,17 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 				   struct ethtool_wolinfo *wol)
 {
 	struct lan743x_adapter *adapter = netdev_priv(netdev);
+	int ret;
+
+	if (netdev->phydev) {
+		ret = phy_ethtool_set_wol(netdev->phydev, wol);
+		if (ret != -EOPNOTSUPP && ret != 0)
+			return ret;
+
+		if (ret == -EOPNOTSUPP)
+			netif_dbg(adapter, drv, adapter->netdev,
+				  "phy does not support WOL\n");
+	}
 
 	adapter->wolopts = 0;
 	if (wol->wolopts & WAKE_UCAST)
@@ -1187,8 +1198,7 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 
 	device_set_wakeup_enable(&adapter->pdev->dev, (bool)wol->wolopts);
 
-	return netdev->phydev ? phy_ethtool_set_wol(netdev->phydev, wol)
-			: -ENETDOWN;
+	return 0;
 }
 #endif /* CONFIG_PM */
 
-- 
2.34.1