linux-kernel - [PATCH net-next] net: phy: realtek: add error handling to rtl8211f_get

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Message-Id: <20250624-realtek_fixes-v1-1-02a0b7c369bc@kuka.com>
Date: Tue, 24 Jun 2025 16:17:33 +0200
From: Daniel Braunwarth via B4 Relay <devnull+daniel.braunwarth.kuka.com@...nel.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>, 
 Jon Hunter <jonathanh@...dia.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Daniel Braunwarth <daniel.braunwarth@...a.com>
Subject: [PATCH net-next] net: phy: realtek: add error handling to
 rtl8211f_get_wol

From: Daniel Braunwarth <daniel.braunwarth@...a.com>

We should check if the WOL settings was successfully read from the PHY.

In case this fails we cannot just use the error code and proceed.

Signed-off-by: Daniel Braunwarth <daniel.braunwarth@...a.com>
Reported-by: Jon Hunter <jonathanh@...dia.com>
Closes: https://lore.kernel.org/baaa083b-9a69-460f-ab35-2a7cb3246ffd@nvidia.com
---
 drivers/net/phy/realtek/realtek_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c
index c3dcb62574303374666b46a454cd4e10de455d24..dd0d675149ad7f9730f04ba1aea82e02b15dfb2c 100644
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
@@ -436,9 +436,15 @@ static irqreturn_t rtl8211f_handle_interrupt(struct phy_device *phydev)

 static void rtl8211f_get_wol(struct phy_device *dev, struct ethtool_wolinfo *wol)
 {
+	int wol_events;
+
 	wol->supported = WAKE_MAGIC;
-	if (phy_read_paged(dev, RTL8211F_WOL_SETTINGS_PAGE, RTL8211F_WOL_SETTINGS_EVENTS)
-	    & RTL8211F_WOL_EVENT_MAGIC)
+
+	wol_events = phy_read_paged(dev, RTL8211F_WOL_SETTINGS_PAGE, RTL8211F_WOL_SETTINGS_EVENTS);
+	if (wol_events < 0)
+		return;
+
+	if (wol_events & RTL8211F_WOL_EVENT_MAGIC)
 		wol->wolopts = WAKE_MAGIC;
 }

---
base-commit: f817b6dd2b62d921a6cdc0a3ac599cd1851f343c
change-id: 20250624-realtek_fixes-85f292cfc1a4

Best regards,
-- 
Daniel Braunwarth <daniel.braunwarth@...a.com>