[PATCH net-next 2/6] net: dsa: simplify netdevice events handling

[Vivien Didelot]

Simplify the code handling the slave netdevice notifier call by
providing a dsa_slave_changeupper helper for NETDEV_CHANGEUPPER, and so
on (only this event is supported at the moment.)

Return NOTIFY_DONE when we did not care about an event, and NOTIFY_OK
when we were concerned but no error occurred, as the API suggests.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 net/dsa/slave.c | 44 ++++++++++++++++----------------------------
 1 file changed, 16 insertions(+), 28 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 949644c1dac2..332eb234dc21 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1491,37 +1491,22 @@ static bool dsa_slave_dev_check(struct net_device *dev)
        return dev->netdev_ops == &dsa_slave_netdev_ops;
 }
 
-static int dsa_slave_port_upper_event(struct net_device *dev,
-                                     unsigned long event, void *ptr)
+static int dsa_slave_changeupper(struct net_device *dev,
+                                struct netdev_notifier_changeupper_info *info)
 {
-       struct netdev_notifier_changeupper_info *info = ptr;
-       struct net_device *upper = info->upper_dev;
-       int err = 0;
+       int err = NOTIFY_DONE;
 
-       switch (event) {
-       case NETDEV_CHANGEUPPER:
-               if (netif_is_bridge_master(upper)) {
-                       if (info->linking)
-                               err = dsa_slave_bridge_port_join(dev, upper);
-                       else
-                               dsa_slave_bridge_port_leave(dev, upper);
+       if (netif_is_bridge_master(info->upper_dev)) {
+               if (info->linking) {
+                       err = dsa_slave_bridge_port_join(dev, info->upper_dev);
+                       err = notifier_from_errno(err);
+               } else {
+                       dsa_slave_bridge_port_leave(dev, info->upper_dev);
+                       err = NOTIFY_OK;
                }
-
-               break;
-       }
-
-       return notifier_from_errno(err);
-}
-
-static int dsa_slave_port_event(struct net_device *dev, unsigned long event,
-                               void *ptr)
-{
-       switch (event) {
-       case NETDEV_CHANGEUPPER:
-               return dsa_slave_port_upper_event(dev, event, ptr);
        }
 
-       return NOTIFY_DONE;
+       return err;
 }
 
 static int dsa_slave_netdevice_event(struct notifier_block *nb,
@@ -1529,8 +1514,11 @@ static int dsa_slave_netdevice_event(struct 
notifier_block *nb,
 {
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 
-       if (dsa_slave_dev_check(dev))
-               return dsa_slave_port_event(dev, event, ptr);
+       if (dev->netdev_ops != &dsa_slave_netdev_ops)
+               return NOTIFY_DONE;
+
+       if (event == NETDEV_CHANGEUPPER)
+               return dsa_slave_changeupper(dev, ptr);
 
        return NOTIFY_DONE;
 }
-- 
2.11.0