Thread (269 messages) 269 messages, 1 author, 2016-01-27
STALE3804d REVIEWED: 1 (0M)

[PATCH 4.2.y-ckt 246/268] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid

From: Kamal Mostafa <hidden>
Date: 2016-01-27 20:47:30
Also in: lkml
Subsystem: networking drivers, team driver, the rest · Maintainers: Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jiri Pirko, Linus Torvalds

4.2.8-ckt3 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Ido Schimmel <redacted>

commit 60a6531bfe49555581ccd65f66a350cc5693fcde upstream.

We can't be within an RCU read-side critical section when deleting
VLANs, as underlying drivers might sleep during the hardware operation.
Therefore, replace the RCU critical section with a mutex. This is
consistent with team_vlan_rx_add_vid.

Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device")
Acked-by: Jiri Pirko <redacted>
Signed-off-by: Ido Schimmel <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <redacted>
---
 drivers/net/team/team.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index daa054b..88058480 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1845,10 +1845,10 @@ static int team_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
 	struct team *team = netdev_priv(dev);
 	struct team_port *port;
 
-	rcu_read_lock();
-	list_for_each_entry_rcu(port, &team->port_list, list)
+	mutex_lock(&team->lock);
+	list_for_each_entry(port, &team->port_list, list)
 		vlan_vid_del(port->dev, proto, vid);
-	rcu_read_unlock();
+	mutex_unlock(&team->lock);
 
 	return 0;
 }
-- 
1.9.1
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