[PATCH net-next 3/3] vxlan: no longer rely on RTNL in vxlan_fill_info()
From: Eric Dumazet <edumazet@google.com>
Date: 2026-07-08 16:04:23
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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> --- drivers/net/vxlan/vxlan_core.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 96ac74fb1eb064d4e280af8ffa68cff37aacbca7..86b853d7739639b93b6468bc64a217c562b4804c 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c@@ -4674,10 +4674,16 @@ 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; const struct vxlan_rdst *dst; + int err = 0; dst = &vxlan->default_dst; - cfg = rtnl_dereference(vxlan->cfg); + rcu_read_lock(); + cfg = rcu_dereference(vxlan->cfg); + if (!cfg) { + err = -ENODEV; + goto out; + } ports.low = htons(cfg->port_min); ports.high = htons(cfg->port_max);
@@ -4777,9 +4783,12 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) &cfg->reserved_bits)) goto nla_put_failure; - return 0; +out: + rcu_read_unlock(); + return err; nla_put_failure: + rcu_read_unlock(); return -EMSGSIZE; }
--
2.55.0.795.g602f6c329a-goog