NETDEV_CHANGENAME is only emitted from netif_change_name().
netif_change_name() has two callers both of which hold netdev_lock_ops()
around the call site:
 - dev_change_name()
 - do_setlink()

Document NETDEV_CHANGENAME as always ops locked.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 Documentation/networking/netdevices.rst | 1 +
 net/core/lock_debug.c                   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Documentation/networking/netdevices.rst b/Documentation/networking/netdevices.rst
index 60492d4df2ee..8fc96975b3bd 100644
--- a/Documentation/networking/netdevices.rst
+++ b/Documentation/networking/netdevices.rst

@@ -415,6 +415,7 @@ instance lock.
 For devices with locked ops, currently only the following notifiers are
 running under the lock:
 * ``NETDEV_CHANGE``
+* ``NETDEV_CHANGENAME``
 * ``NETDEV_REGISTER``
 * ``NETDEV_UP``
 

diff --git a/net/core/lock_debug.c b/net/core/lock_debug.c
index 14fd8fcdcd56..8a81c5430705 100644
--- a/net/core/lock_debug.c
+++ b/net/core/lock_debug.c

@@ -65,6 +65,7 @@ int netdev_debug_event(struct notifier_block *nb, unsigned long event,
 		break;
 
 	case NETDEV_CHANGENAME:
+		netdev_assert_locked_ops(dev);
 		ASSERT_RTNL_NET(net);
 		break;
 	}

-- 
2.54.0