[PATCH v3 net-next 6/6] vxlan: no longer rely on RTNL in vxlan_fill_info()

[Eric Dumazet <edumazet@google.com>]

Now that vxlan->cfg is RCU-protected, we can update vxlan_fill_info()
to run under RCU read lock instead of relying on RTNL.

This completes the transition to RTNL-less link info dumping for VXLAN.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 drivers/net/vxlan/vxlan_core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 8b7558eac049d2f83ab5f68aca2dad62bce9cbc7..8f008ec6d2e98dc015649fd6e26a1346012c2238 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -4725,7 +4725,8 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	struct ifla_vxlan_port_range ports;
 	const struct vxlan_config *cfg;
 
-	cfg = rtnl_dereference(vxlan->cfg);
+	rcu_read_lock();
+	cfg = rcu_dereference(vxlan->cfg);
 
 	if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(cfg->vni)))
 		goto nla_put_failure;
@@ -4824,9 +4825,11 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 		    &cfg->reserved_bits))
 		goto nla_put_failure;
 
+	rcu_read_unlock();
 	return 0;
 
 nla_put_failure:
+	rcu_read_unlock();
 	return -EMSGSIZE;
 }
 
-- 
2.55.0.1007.g17ff1f9808-goog