batman-adv: update kernel doc of batadv_tt_global_del_orig_entry()

The updated kernel doc & additional comment shall prevent accidental
copy & paste errors or calling the function without the required
precautions.

Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 7e34901e214c..6b5f718f6705 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -1658,20 +1658,26 @@ out:
 }
 
 /**
- * batadv_tt_global_del_orig_entry - remove and free an orig_entry
+ * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
  * @tt_global_entry: the global entry to remove the orig_entry from
  * @orig_entry: the orig entry to remove and free
  *
  * Remove an orig_entry from its list in the given tt_global_entry and
  * free this orig_entry afterwards.
+ *
+ * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
+ * part of a list.
  */
 static void
-batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
-                                struct batadv_tt_orig_list_entry *orig_entry)
+_batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
+                                 struct batadv_tt_orig_list_entry *orig_entry)
 {
         batadv_tt_global_size_dec(orig_entry->orig_node,
                                   tt_global_entry->common.vid);
         atomic_dec(&tt_global_entry->orig_list_count);
+        /* requires holding tt_global_entry->list_lock and orig_entry->list
+         * being part of a list
+         */
         hlist_del_rcu(&orig_entry->list);
         batadv_tt_orig_list_entry_free_ref(orig_entry);
 }
@@ -1687,7 +1693,7 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
         spin_lock_bh(&tt_global_entry->list_lock);
         head = &tt_global_entry->orig_list;
         hlist_for_each_entry_safe(orig_entry, safe, head, list)
-                batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
+                _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
         spin_unlock_bh(&tt_global_entry->list_lock);
 }
 
@@ -1722,8 +1728,8 @@ batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
                                    orig_node->orig,
                                    tt_global_entry->common.addr,
                                    BATADV_PRINT_VID(vid), message);
-                        batadv_tt_global_del_orig_entry(tt_global_entry,
-                                                        orig_entry);
+                        _batadv_tt_global_del_orig_entry(tt_global_entry,
+                                                         orig_entry);
                 }
         }
         spin_unlock_bh(&tt_global_entry->list_lock);