Subject: [PATCH net-next v2 11/11] net: ethtool: make sure __ethtool_get_link_ksettings() is ops-locked

From: Jakub Kicinski <[email-masked]>
Date: Tue, 2 Jun 2026 18:28:40 -0700

All drivers which may call *_get_link_ksettings() on ops-locked
devices from paths already holding the ops lock are ready now.
Make __ethtool_get_link_ksettings() take the ops lock, and assert
that it's held in netif_get_link_ksettings().

Signed-off-by: Jakub Kicinski <[email-masked]>
---
 net/ethtool/ioctl.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 49da873b673d..a4b0cbae4063 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -439,7 +439,7 @@ struct ethtool_link_usettings {
 int netif_get_link_ksettings(struct net_device *dev,
 			     struct ethtool_link_ksettings *link_ksettings)
 {
-	/* once callers fixed - assert ops locked */
+	netdev_assert_locked_ops_compat(dev);
 
 	if (!dev->ethtool_ops->get_link_ksettings)
 		return -EOPNOTSUPP;
@@ -456,10 +456,14 @@ EXPORT_SYMBOL(netif_get_link_ksettings);
 int __ethtool_get_link_ksettings(struct net_device *dev,
 				 struct ethtool_link_ksettings *link_ksettings)
 {
+	int ret;
+
 	ASSERT_RTNL();
 
-	/* once callers fixed - take the ops lock around this call */
-	return netif_get_link_ksettings(dev, link_ksettings);
+	netdev_lock_ops(dev);
+	ret = netif_get_link_ksettings(dev, link_ksettings);
+	netdev_unlock_ops(dev);
+	return ret;
 }
 EXPORT_SYMBOL(__ethtool_get_link_ksettings);
 
-- 
2.54.0