linux-kernel - [PATCH net-next 3/6] net: dsa: rollback bridging on error

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Date:   Fri,  3 Feb 2017 13:20:18 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, cphealy@...il.com,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: [PATCH net-next 3/6] net: dsa: rollback bridging on error

When an error is returned during the bridging of a port in a
NETDEV_CHANGEUPPER event, net/core/dev.c rolls back the operation.

Be consistent and unassign dp->bridge_dev when this happens.

In the meantime, add comments to document this behavior.

Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
---
 net/dsa/slave.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 332eb234dc21..d726307c7795 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -562,12 +562,21 @@ static int dsa_slave_bridge_port_join(struct net_device *dev,
 	struct dsa_switch *ds = p->dp->ds;
 	int ret = -EOPNOTSUPP;
 
+	/* Here the port is already bridged. Reflect the current configuration
+	 * so that drivers can program their chips accordingly.
+	 */
 	p->dp->bridge_dev = br;
 
 	if (ds->ops->port_bridge_join)
 		ret = ds->ops->port_bridge_join(ds, p->dp->index, br);
 
-	return ret == -EOPNOTSUPP ? 0 : ret;
+	/* The bridging is rolled back on error */
+	if (ret && ret != -EOPNOTSUPP) {
+		p->dp->bridge_dev = NULL;
+		return ret;
+	}
+
+	return 0;
 }
 
 static void dsa_slave_bridge_port_leave(struct net_device *dev,
@@ -576,6 +585,9 @@ static void dsa_slave_bridge_port_leave(struct net_device *dev,
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->dp->ds;
 
+	/* Here the port is already unbridged. Reflect the current configuration
+	 * so that drivers can program their chips accordingly.
+	 */
 	p->dp->bridge_dev = NULL;
 
 	if (ds->ops->port_bridge_leave)
-- 
2.11.0