From: Hangbin Liu <liuhangbin@gmail.com>
To: netdev@vger.kernel.org
Cc: Jiri Pirko <jiri@mellanox.com>,
"David S . Miller" <davem@davemloft.net>,
Paolo Abeni <pabeni@redhat.com>,
Hangbin Liu <liuhangbin@gmail.com>
Subject: [PATCH net] team: call RCU read lock when walking the port_list
Date: Tue, 8 Oct 2019 21:56:14 +0800 [thread overview]
Message-ID: <20191008135614.15224-1-liuhangbin@gmail.com> (raw)
Before reading the team port list, we need to acquire the RCU read lock.
Also change list_for_each_entry() to list_for_each_entry_rcu().
Fixes: 9ed68ca0d90b ("team: add ethtool get_link_ksettings")
Reported-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
---
drivers/net/team/team.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index e8089def5a46..cb1d5fe60c31 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2066,7 +2066,8 @@ static int team_ethtool_get_link_ksettings(struct net_device *dev,
cmd->base.duplex = DUPLEX_UNKNOWN;
cmd->base.port = PORT_OTHER;
- list_for_each_entry(port, &team->port_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(port, &team->port_list, list) {
if (team_port_txable(port)) {
if (port->state.speed != SPEED_UNKNOWN)
speed += port->state.speed;
@@ -2075,6 +2076,8 @@ static int team_ethtool_get_link_ksettings(struct net_device *dev,
cmd->base.duplex = port->state.duplex;
}
}
+ rcu_read_unlock();
+
cmd->base.speed = speed ? : SPEED_UNKNOWN;
return 0;
--
2.19.2
next reply other threads:[~2019-10-08 13:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-08 13:56 Hangbin Liu [this message]
2019-10-08 14:13 ` [PATCH net] team: call RCU read lock when walking the port_list Jiri Pirko
2019-10-09 2:28 ` Jakub Kicinski
2019-10-09 12:18 ` [PATCHv2 net-next] " Hangbin Liu
2019-10-10 4:15 ` Jakub Kicinski
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