netdev - [patch net-next 1/8] bridge: Propagate vlan add failure to user

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Message-Id: <1452075116-5726-2-git-send-email-jiri@resnulli.us>
Date:	Wed,  6 Jan 2016 11:11:49 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
	yotamg@...lanox.com, ogerlitz@...lanox.com,
	stephen@...workplumber.org
Subject: [patch net-next 1/8] bridge: Propagate vlan add failure to user

From: Elad Raz <eladr@...lanox.com>

Disallow adding interfaces to a bridge when vlan filtering operation
failed. Send the failure code to the user.

Signed-off-by: Elad Raz <eladr@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 net/bridge/br_if.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 8d1d4a2..3bd46f4 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -511,8 +511,10 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 	if (br_fdb_insert(br, p, dev->dev_addr, 0))
 		netdev_err(dev, "failed insert local address bridge forwarding table\n");
 
-	if (nbp_vlan_init(p))
+	if (nbp_vlan_init(p)) {
 		netdev_err(dev, "failed to initialize vlan filtering on this port\n");
+		goto err6;
+	}
 
 	spin_lock_bh(&br->lock);
 	changed_addr = br_stp_recalculate_bridge_id(br);
@@ -533,6 +535,12 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 
 	return 0;
 
+err6:
+	list_del_rcu(&p->list);
+	br_fdb_delete_by_port(br, p, 0, 1);
+	nbp_update_port_count(br);
+	netdev_upper_dev_unlink(dev, br->dev);
+
 err5:
 	dev->priv_flags &= ~IFF_BRIDGE_PORT;
 	netdev_rx_handler_unregister(dev);
-- 
1.9.3

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