[PATCH RFC net-next 05/13] net: bridge: multicast: propagate br_mc_disabled_update() return

[Vladimir Oltean]

From: Florian Fainelli <f.faine...@gmail.com>

Some Ethernet switches might not be able to support disabling multicast
flooding globally when e.g: several bridges span the same physical
device, propagate the return value of br_mc_disabled_update() such that
this propagates correctly to user-space.

Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.olt...@nxp.com>
---
 net/bridge/br_multicast.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index ad12fe3fca8c..9e93035b1483 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -809,7 +809,7 @@ static void br_ip6_multicast_port_query_expired(struct 
timer_list *t)
 }
 #endif
 
-static void br_mc_disabled_update(struct net_device *dev, bool value)
+static int br_mc_disabled_update(struct net_device *dev, bool value)
 {
        struct switchdev_attr attr = {
                .orig_dev = dev,
@@ -818,11 +818,13 @@ static void br_mc_disabled_update(struct net_device *dev, 
bool value)
                .u.mc_disabled = !value,
        };
 
-       switchdev_port_attr_set(dev, &attr);
+       return switchdev_port_attr_set(dev, &attr);
 }
 
 int br_multicast_add_port(struct net_bridge_port *port)
 {
+       int ret;
+
        port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 
        timer_setup(&port->multicast_router_timer,
@@ -833,8 +835,11 @@ int br_multicast_add_port(struct net_bridge_port *port)
        timer_setup(&port->ip6_own_query.timer,
                    br_ip6_multicast_port_query_expired, 0);
 #endif
-       br_mc_disabled_update(port->dev,
-                             br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
+       ret = br_mc_disabled_update(port->dev,
+                                   br_opt_get(port->br,
+                                              BROPT_MULTICAST_ENABLED));
+       if (ret)
+               return ret;
 
        port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
        if (!port->mcast_stats)
@@ -2049,12 +2054,16 @@ static void br_multicast_start_querier(struct 
net_bridge *br,
 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
 {
        struct net_bridge_port *port;
+       int err = 0;
 
        spin_lock_bh(&br->multicast_lock);
        if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
                goto unlock;
 
-       br_mc_disabled_update(br->dev, val);
+       err = br_mc_disabled_update(br->dev, val);
+       if (err && err != -EOPNOTSUPP)
+               goto unlock;
+
        br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
        if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
                br_multicast_leave_snoopers(br);
@@ -2071,7 +2080,7 @@ int br_multicast_toggle(struct net_bridge *br, unsigned 
long val)
 unlock:
        spin_unlock_bh(&br->multicast_lock);
 
-       return 0;
+       return err;
 }
 
 bool br_multicast_enabled(const struct net_device *dev)
-- 
2.25.1