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[RFC] batman-adv: make mc_forwarding atomic

Message ID 20220208071942.7884-1-sven@narfation.org
State RFC, archived
Delegated to: Simon Wunderlich
Headers show
Series [RFC] batman-adv: make mc_forwarding atomic | expand

Commit Message

Sven Eckelmann Feb. 8, 2022, 7:19 a.m. UTC 
From: Eric Dumazet <edumazet@google.com>

This fixes minor data-races in ip6_mc_input() and
batadv_mcast_mla_rtr_flags_softif_get_ipv6()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net-next commit 145c7a793838 ("ipv6: make mc_forwarding atomic")

This still needs compat code - does anyone have ideas?

 net/batman-adv/multicast.c | 2 +-
 5 files changed, 9 insertions(+), 9 deletions(-)
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Patch

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index f4004cf0ff6f..9f311fddfaf9 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -134,7 +134,7 @@  static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev)
 {
 	struct inet6_dev *in6_dev = __in6_dev_get(dev);
 
-	if (in6_dev && in6_dev->cnf.mc_forwarding)
+	if (in6_dev && atomic_read(&in6_dev->cnf.mc_forwarding))
 		return BATADV_NO_FLAGS;
 	else
 		return BATADV_MCAST_WANT_NO_RTR6;