linux-kernel - [PATCH 3.12 39/64] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill

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Message-Id: <dfeed78690acfc3eb5bb2b6f3a8af2ed846077d4.1455198893.git.jslaby@suse.cz>
Date:	Thu, 11 Feb 2016 14:59:15 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Ido Schimmel <idosch@...lanox.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 39/64] team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid

From: Ido Schimmel <idosch@...lanox.com>

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

===============

[ 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@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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 020581ddfdd3..3059b8c3825f 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -1831,10 +1831,10 @@ 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;
 }
-- 
2.7.1