batman-adv: Use rcu_dereference_protected by update-side
Usually rcu_dereference isn't necessary in situations were the
RCU-protected data structure cannot change, but sparse and lockdep still
need a similar functionality for analysis. rcu_dereference_protected
implements the reduced version which should be used to support the
dynamic and static analysis.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index a44dff3..ab597c4 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -86,7 +86,7 @@
if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
new_gw_node = NULL;
- curr_gw_node = bat_priv->curr_gw;
+ curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1);
rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
if (curr_gw_node)