net: phy: realtek: add error handling to rtl8211f_get_wol

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 <[email protected]>
Reported-by: Jon Hunter <[email protected]>
Closes: https://lore.kernel.org/[email protected]
Reviewed-by: Andrew Lunn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: d4nuu8

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;
 }