net: macvlan: Use built-in RCU list checking

hlist_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to hlist_for_each_entry_rcu() to silence false
lockdep warning when CONFIG_PROVE_RCU_LIST is enabled.

Execute as follow:

 ip link add link eth0 type macvlan mode source macaddr add <MAC-ADDR>

The rtnl_lock is held when macvlan_hash_lookup_source() or
macvlan_fill_info_macaddr() are called in the non-RCU read side section.
So, pass lockdep_rtnl_is_held() to silence false lockdep warning.

Fixes: 79cf79abce71 ("macvlan: add source mode")
Signed-off-by: Chuang Wang <nashuiliang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 578897a..b8cc55b 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -141,7 +141,7 @@ static struct macvlan_source_entry *macvlan_hash_lookup_source(
        u32 idx = macvlan_eth_hash(addr);
        struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
 
-       hlist_for_each_entry_rcu(entry, h, hlist) {
+       hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
                if (ether_addr_equal_64bits(entry->addr, addr) &&
                    entry->vlan == vlan)
                        return entry;
@@ -1647,7 +1647,7 @@ static int macvlan_fill_info_macaddr(struct sk_buff *skb,
        struct hlist_head *h = &vlan->port->vlan_source_hash[i];
        struct macvlan_source_entry *entry;
 
-       hlist_for_each_entry_rcu(entry, h, hlist) {
+       hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
                if (entry->vlan != vlan)
                        continue;
                if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))