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[PATCH 4.4 52/67] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid

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  [PATCH 4.4 52/67] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-27 21:40 +0100

#1319725 — [PATCH 4.4 52/67] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid

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

------------------

From: Ido Schimmel <idosch@mellanox.com>

[ Upstream commit 60a6531bfe49555581ccd65f66a350cc5693fcde ]

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 <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/team/team.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1845,10 +1845,10 @@ static int team_vlan_rx_kill_vid(struct
 	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;
 }

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