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net: hsr: Pass lockdep expression to RCU lists

PATCH Superseded Amol Grover 1 participant 1 message Feb 19, 2020

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Networking HSR network protocol
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Amol Grover

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PATCH 1/1 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 <[email protected]>
---
 net/hsr/hsr_framereg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
net/hsr/hsr_framereg.c +2 -1
index 27dc65d7de67..cc8fcfd3918d 100644
@@ -156,7 +156,8 @@ 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))
Signature · 1 line
2.24.1