Currently, it is possible to let some PHYs to advertise not supported
EEE link modes. So, validate them before overwriting existing
configuration.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/phy/phy-c45.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 8717c122e2f3..3813b86689d0 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -1438,12 +1438,23 @@ int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 	int ret;
 
 	if (data->eee_enabled) {
-		if (data->advertised)
+		if (data->advertised) {
+			__ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
+
+			ethtool_convert_legacy_u32_to_link_mode(adv,
+								data->advertised);
+			linkmode_andnot(adv, adv, phydev->supported_eee);
+			if (!linkmode_empty(adv)) {
+				phydev_warn(phydev, "At least some EEE link modes are not supported.\n");
+				return -EINVAL;
+			}
+
 			ethtool_convert_legacy_u32_to_link_mode(phydev->advertising_eee,
 								data->advertised);
-		else
+		} else {
 			linkmode_copy(phydev->advertising_eee,
 				      phydev->supported_eee);
+		}
 
 		phydev->eee_enabled = true;
 	} else {
-- 
2.30.2

On Wed, Feb 22, 2023 at 06:50:43AM +0100, Oleksij Rempel wrote:
> Currently, it is possible to let some PHYs to advertise not supported
> EEE link modes. So, validate them before overwriting existing
> configuration.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Thanks!

-- 
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