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net: hsr: fix hsr build error when lockdep is not enabled

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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: e7f2742068 ("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>
This commit is contained in:
Juhee Kang 2022-02-20 15:32:50 +00:00 committed by Jakub Kicinski
parent 7b779cc884
commit a0b92e0514
2 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
net/hsr/hsr_framereg.c
View File

@ -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;

8
net/hsr/hsr_framereg.h
View File

@ -28,8 +28,14 @@ struct hsr_frame_info {
bool is_from_san;
};
#ifdef CONFIG_LOCKDEP
int lockdep_hsr_is_held(spinlock_t *lock);
#else
#define lockdep_hsr_is_held(lock) 1
#endif
u32 hsr_mac_hash(struct hsr_priv *hsr, const unsigned char *addr);
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);
void hsr_del_self_node(struct hsr_priv *hsr);
void hsr_del_nodes(struct hlist_head *node_db);
struct hsr_node *hsr_get_node(struct hsr_port *port, struct hlist_head *node_db,