batman-adv: protect the local and the global trans-tables with rcu

The local and the global translation-tables are now lock free and rcu
protected.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>

1 files changed, 6 insertions, 7 deletions

diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 355c6e590b0c..8a1b98589d76 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -665,11 +665,12 @@ next:
 
         hash = bat_priv->tt_local_hash;
 
-        spin_lock_bh(&bat_priv->tt_lhash_lock);
         for (i = 0; i < hash->size; i++) {
                 head = &hash->table[i];
 
-                hlist_for_each_entry(tt_local_entry, node, head, hash_entry) {
+                rcu_read_lock();
+                hlist_for_each_entry_rcu(tt_local_entry, node, head,
+                                         hash_entry) {
                         entry = (struct vis_info_entry *)
                                         skb_put(info->skb_packet,
                                                 sizeof(*entry));
@@ -678,14 +679,12 @@ next:
                         entry->quality = 0; /* 0 means TT */
                         packet->entries++;
 
-                        if (vis_packet_full(info)) {
-                                spin_unlock_bh(&bat_priv->tt_lhash_lock);
-                                return 0;
-                        }
+                        if (vis_packet_full(info))
+                                goto unlock;
                 }
+                rcu_read_unlock();
         }
 
-        spin_unlock_bh(&bat_priv->tt_lhash_lock);
         return 0;
 
 unlock: