net: replace dev_addr_sem with netdev instance lock

Lockdep reports possible circular dependency in [0]. Instead of
fixing the ordering, replace global dev_addr_sem with netdev
instance lock. Most of the paths that set/get mac are RTNL
protected. Two places where it's not, convert to explicit
locking:
- sysfs address_show
- dev_get_mac_address via dev_ioctl

0: https://netdev-3.bots.linux.dev/vmksft-forwarding-dbg/results/993321/24-router-bridge-1d-lag-sh/stderr

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250305163732.2766420-12-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 2 insertions, 15 deletions

diff --git a/net/core/dev_api.c b/net/core/dev_api.c
index 98db990ce21c..655a95fb7baa 100644
--- a/net/core/dev_api.c
+++ b/net/core/dev_api.c
@@ -82,19 +82,6 @@ void dev_set_group(struct net_device *dev, int new_group)
 	netdev_unlock_ops(dev);
 }
 
-int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
-			     struct netlink_ext_ack *extack)
-{
-	int ret;
-
-	netdev_lock_ops(dev);
-	ret = netif_set_mac_address_user(dev, sa, extack);
-	netdev_unlock_ops(dev);
-
-	return ret;
-}
-EXPORT_SYMBOL(dev_set_mac_address_user);
-
 /**
  * dev_change_net_namespace() - move device to different nethost namespace
  * @dev: device
@@ -310,9 +297,9 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
 {
 	int ret;
 
-	netdev_lock_ops(dev);
+	netdev_lock(dev);
 	ret = netif_set_mac_address(dev, sa, extack);
-	netdev_unlock_ops(dev);
+	netdev_unlock(dev);
 
 	return ret;
 }