From: Vivien Didelot Date: Fri, 3 Feb 2017 18:20:18 +0000 (-0500) Subject: net: dsa: rollback bridging on error X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9c26542685130ef3b55cdb4e04eec0ac33376b41;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: David S. Miller --- 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)