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authorJuhee Kang <claudiajkang@gmail.com>2022-02-20 18:32:50 +0300
committerJakub Kicinski <kuba@kernel.org>2022-02-22 07:43:10 +0300
commita0b92e0514bb3c5e57c33fd720724a629f67e042 (patch)
treefae08e62f84df38c62de933e627229b72e3fa056 /net/hsr/hsr_framereg.c
parent7b779cc8846ae0bfdad8eca7b751109a5cf930b7 (diff)
downloadlinux-a0b92e0514bb3c5e57c33fd720724a629f67e042.tar.xz
net: hsr: fix hsr build error when lockdep is not enabled
In hsr, lockdep_is_held() is needed for rcu_dereference_bh_check(). But if lockdep is not enabled, lockdep_is_held() causes a build error: ERROR: modpost: "lockdep_is_held" [net/hsr/hsr.ko] undefined! Thus, this patch solved by adding lockdep_hsr_is_held(). This helper function calls the lockdep_is_held() when lockdep is enabled, and returns 1 if not defined. Fixes: e7f27420681f ("net: hsr: fix suspicious RCU usage warning in hsr_node_get_first()") Reported-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Juhee Kang <claudiajkang@gmail.com> Link: https://lore.kernel.org/r/20220220153250.5285-1-claudiajkang@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/hsr/hsr_framereg.c')
-rw-r--r--net/hsr/hsr_framereg.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 62272d76545c..584e21788799 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -20,6 +20,13 @@
#include "hsr_framereg.h"
#include "hsr_netlink.h"
+#ifdef CONFIG_LOCKDEP
+int lockdep_hsr_is_held(spinlock_t *lock)
+{
+ return lockdep_is_held(lock);
+}
+#endif
+
u32 hsr_mac_hash(struct hsr_priv *hsr, const unsigned char *addr)
{
u32 hash = jhash(addr, ETH_ALEN, hsr->hash_seed);
@@ -27,11 +34,12 @@ u32 hsr_mac_hash(struct hsr_priv *hsr, const unsigned char *addr)
return reciprocal_scale(hash, hsr->hash_buckets);
}
-struct hsr_node *hsr_node_get_first(struct hlist_head *head, int cond)
+struct hsr_node *hsr_node_get_first(struct hlist_head *head, spinlock_t *lock)
{
struct hlist_node *first;
- first = rcu_dereference_bh_check(hlist_first_rcu(head), cond);
+ first = rcu_dereference_bh_check(hlist_first_rcu(head),
+ lockdep_hsr_is_held(lock));
if (first)
return hlist_entry(first, struct hsr_node, mac_list);
@@ -59,8 +67,7 @@ bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
{
struct hsr_node *node;
- node = hsr_node_get_first(&hsr->self_node_db,
- lockdep_is_held(&hsr->list_lock));
+ node = hsr_node_get_first(&hsr->self_node_db, &hsr->list_lock);
if (!node) {
WARN_ONCE(1, "HSR: No self node\n");
return false;
@@ -107,8 +114,7 @@ int hsr_create_self_node(struct hsr_priv *hsr,
ether_addr_copy(node->macaddress_B, addr_b);
spin_lock_bh(&hsr->list_lock);
- oldnode = hsr_node_get_first(self_node_db,
- lockdep_is_held(&hsr->list_lock));
+ oldnode = hsr_node_get_first(self_node_db, &hsr->list_lock);
if (oldnode) {
hlist_replace_rcu(&oldnode->mac_list, &node->mac_list);
spin_unlock_bh(&hsr->list_lock);
@@ -127,8 +133,7 @@ void hsr_del_self_node(struct hsr_priv *hsr)
struct hsr_node *node;
spin_lock_bh(&hsr->list_lock);
- node = hsr_node_get_first(self_node_db,
- lockdep_is_held(&hsr->list_lock));
+ node = hsr_node_get_first(self_node_db, &hsr->list_lock);
if (node) {
hlist_del_rcu(&node->mac_list);
kfree_rcu(node, rcu_head);
@@ -194,7 +199,7 @@ static struct hsr_node *hsr_add_node(struct hsr_priv *hsr,
spin_lock_bh(&hsr->list_lock);
hlist_for_each_entry_rcu(node, node_db, mac_list,
- lockdep_is_held(&hsr->list_lock)) {
+ lockdep_hsr_is_held(&hsr->list_lock)) {
if (ether_addr_equal(node->macaddress_A, addr))
goto out;
if (ether_addr_equal(node->macaddress_B, addr))
@@ -601,7 +606,7 @@ void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
if (!_pos) {
node = hsr_node_get_first(&hsr->node_db[hash],
- lockdep_is_held(&hsr->list_lock));
+ &hsr->list_lock);
if (node)
ether_addr_copy(addr, node->macaddress_A);
return node;