From: Chuang Wang <nashuiliang@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Chuang Wang <nashuiliang@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Michael Braun <michael-dev@fami-braun.de>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net v2] net: macvlan: Use built-in RCU list checking
Date: Fri, 11 Nov 2022 09:41:30 +0800 [thread overview]
Message-ID: <20221111014131.693854-1-nashuiliang@gmail.com> (raw)
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>
---
v1 -> v2:
- fix the patch Subject, add a Fixed tag
v0 -> v1:
- fix typo
drivers/net/macvlan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 578897aaada0..b8cc55b2d721 100644
--- 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))
--
2.37.2
next reply other threads:[~2022-11-11 1:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-11 1:41 Chuang Wang [this message]
2022-11-14 11:00 ` [PATCH net v2] net: macvlan: Use built-in RCU list checking patchwork-bot+netdevbpf
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