[PATCH RFC batadv 03/12] batman-adv: tt: replace forward gotos in batadv_tt_local_add()

batadv_tt_local_add() used two labels in the middle of the function to
express which parts of the common tail have to be executed: "add_event" to
announce a (re-)added client and "check_roaming" to skip that announcement.
Jumping forward into the middle of a function makes it hard to see which
path ends up sending an ADD event. Especially since the PENDING branch
reached "add_event" while the branch right below it reached "check_roaming"
instead.

Express the same in an "added" variable and turn the two client cases into
a plain if/else. The PENDING check returned early before the ROAM check
could run, so it becomes an "else if".

Signed-off-by: Sven Eckelmann <[email protected]>
---
 net/batman-adv/translation-table.c | 47 ++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 25 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 8726bbba..5405be65 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -870,6 +870,7 @@ bool batadv_tt_local_add(struct net_device *mesh_iface, const u8 *addr,
 	struct batadv_tt_global_entry *tt_global = NULL;
 	struct batadv_tt_local_entry *tt_local;
 	bool roamed_back = false;
+	bool added = false;
 	bool iif_is_wifi;
 	bool ret = false;
 	u8 remote_flags;
@@ -898,12 +899,8 @@ bool batadv_tt_local_add(struct net_device *mesh_iface, const u8 *addr,
 			 * flag can be reset like it was never enqueued
 			 */
 			tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
-			spin_unlock_bh(&tt_local->common.flags_lock);
-
-			goto add_event;
-		}
-
-		if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
+			added = true;
+		} else if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
 				   "Roaming client %pM (vid: %d) came back to its original location\n",
 				   addr, batadv_print_vid(vid));
@@ -916,29 +913,29 @@ bool batadv_tt_local_add(struct net_device *mesh_iface, const u8 *addr,
 			roamed_back = true;
 		}
 		spin_unlock_bh(&tt_local->common.flags_lock);
+	} else {
+		tt_local = batadv_tt_local_create(mesh_iface, addr, vid, iif_is_wifi);
+		if (!tt_local)
+			goto out;
 
-		goto check_roaming;
+		kref_get(&tt_local->common.refcount);
+		hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
+					     batadv_choose_tt, &tt_local->common,
+					     &tt_local->common.hash_entry);
+
+		if (unlikely(hash_added != 0)) {
+			/* remove the reference for the hash */
+			batadv_tt_local_entry_put(tt_local);
+			goto out;
+		}
+
+		added = true;
 	}
 
-	tt_local = batadv_tt_local_create(mesh_iface, addr, vid, iif_is_wifi);
-	if (!tt_local)
-		goto out;
+	/* announce the (re-)added client to the mesh */
+	if (added)
+		batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 
-	kref_get(&tt_local->common.refcount);
-	hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
-				     batadv_choose_tt, &tt_local->common,
-				     &tt_local->common.hash_entry);
-
-	if (unlikely(hash_added != 0)) {
-		/* remove the reference for the hash */
-		batadv_tt_local_entry_put(tt_local);
-		goto out;
-	}
-
-add_event:
-	batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
-
-check_roaming:
 	batadv_tt_local_add_roam(bat_priv, tt_global, roamed_back);
 
 	spin_lock_bh(&tt_local->common.flags_lock);

-- 
2.47.3