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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@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-02-03 13:20:18 -05:00 committed by David S. Miller
parent 8e92ab3a42
commit 9c26542685
1 changed files with 13 additions and 1 deletions
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14
net/dsa/slave.c
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@ -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)