[RFC PATCH net-next 2/3] net: dsa: move switchdev event implementation under the same switch/case statement

[Vladimir Oltean]

We'll need to start listening to SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE
events even for interfaces where dsa_slave_dev_check returns false, so
we need that check inside the switch-case statement for SWITCHDEV_FDB_*.

This movement also avoids two useless allocation / free paths for
switchdev_work, which were difficult to avoid before, due to the code's
structure:
- on the untreated "default event" case.
- on the case where fdb_info->added_by_user is false.

Signed-off-by: Vladimir Oltean <olte...@gmail.com>
---
 net/dsa/slave.c | 43 +++++++++++++++++++------------------------
 1 file changed, 19 insertions(+), 24 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 30db8230e30b..b34da39722c7 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2130,50 +2130,45 @@ static int dsa_slave_switchdev_event(struct 
notifier_block *unused,
        struct dsa_port *dp;
        int err;
 
-       if (event == SWITCHDEV_PORT_ATTR_SET) {
+       switch (event) {
+       case SWITCHDEV_PORT_ATTR_SET:
                err = switchdev_handle_port_attr_set(dev, ptr,
                                                     dsa_slave_dev_check,
                                                     dsa_slave_port_attr_set);
                return notifier_from_errno(err);
-       }
-
-       if (!dsa_slave_dev_check(dev))
-               return NOTIFY_DONE;
-
-       dp = dsa_slave_to_port(dev);
-
-       switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
-       if (!switchdev_work)
-               return NOTIFY_BAD;
-
-       INIT_WORK(&switchdev_work->work,
-                 dsa_slave_switchdev_event_work);
-       switchdev_work->ds = dp->ds;
-       switchdev_work->port = dp->index;
-       switchdev_work->event = event;
-
-       switch (event) {
        case SWITCHDEV_FDB_ADD_TO_DEVICE:
        case SWITCHDEV_FDB_DEL_TO_DEVICE:
                fdb_info = ptr;
 
-               if (!fdb_info->added_by_user) {
-                       kfree(switchdev_work);
+               if (!dsa_slave_dev_check(dev))
+                       return NOTIFY_DONE;
+
+               if (!fdb_info->added_by_user)
                        return NOTIFY_OK;
-               }
+
+               dp = dsa_slave_to_port(dev);
+
+               switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
+               if (!switchdev_work)
+                       return NOTIFY_BAD;
+
+               INIT_WORK(&switchdev_work->work,
+                         dsa_slave_switchdev_event_work);
+               switchdev_work->ds = dp->ds;
+               switchdev_work->port = dp->index;
+               switchdev_work->event = event;
 
                ether_addr_copy(switchdev_work->addr,
                                fdb_info->addr);
                switchdev_work->vid = fdb_info->vid;
 
                dev_hold(dev);
+               dsa_schedule_work(&switchdev_work->work);
                break;
        default:
-               kfree(switchdev_work);
                return NOTIFY_DONE;
        }
 
-       dsa_schedule_work(&switchdev_work->work);
        return NOTIFY_OK;
 }
 
-- 
2.25.1