From: Eric Dumazet <edumazet@xxxxxxxxxx> [ Upstream commit 17ef8efc00b34918b966388b2af0993811895a8c ] As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()")) I think the synchronize_net() call in ipv6_mc_down() is not needed. Under load, synchronize_net() can last between 200 usec and 5 ms. KASAN seems to agree as well. Fixes: f185de28d9ae ("mld: add new workqueues for process mld events") Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Taehee Yoo <ap420073@xxxxxxxxx> Cc: Cong Wang <xiyou.wangcong@xxxxxxxxx> Cc: David Ahern <dsahern@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- net/ipv6/mcast.c | 1 - 1 file changed, 1 deletion(-) diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 0ea7d97cdc025..6e5d1ade48a89 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -2722,7 +2722,6 @@ void ipv6_mc_down(struct inet6_dev *idev) /* Should stop work after group drop. or we will * start work again in mld_ifc_event() */ - synchronize_net(); mld_query_stop_work(idev); mld_report_stop_work(idev); -- 2.43.0