net: hsr: Pass lockdep expression to RCU lists

node_db is traversed using list_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of hsr->list_lock.

Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.

Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 364ea2c..3ba7f61 100644 (file)
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -155,7 +155,8 @@ static struct hsr_node *hsr_add_node(struct hsr_priv *hsr,
                new_node->seq_out[i] = seq_out;
 
        spin_lock_bh(&hsr->list_lock);
-       list_for_each_entry_rcu(node, node_db, mac_list) {
+       list_for_each_entry_rcu(node, node_db, mac_list,
+                               lockdep_is_held(&hsr->list_lock)) {
                if (ether_addr_equal(node->macaddress_A, addr))
                        goto out;
                if (ether_addr_equal(node->macaddress_B, addr))