batman-adv: Initialize lockdep class keys for hashes

The hash for claim and backbone hash in the bridge loop avoidance code receive
the same key because they are getting initialized by hash_new with the same
key. Lockdep will create a backtrace when they are used recursively. This can
be avoided by reinitializing the key directly after the hash_new.

Signed-off-by: Sven Eckelmann <sven@narfation.org>

3 files changed, 26 insertions, 0 deletions

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 8bf97515a77d..5c1ac559edbb 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -1127,6 +1127,14 @@ out:
         bla_start_timer(bat_priv);
 }
 
+/* The hash for claim and backbone hash receive the same key because they
+ * are getting initialized by hash_new with the same key. Reinitializing
+ * them with to different keys to allow nested locking without generating
+ * lockdep warnings
+ */
+static struct lock_class_key claim_hash_lock_class_key;
+static struct lock_class_key backbone_hash_lock_class_key;
+
 /* initialize all bla structures */
 int bla_init(struct bat_priv *bat_priv)
 {
@@ -1164,6 +1172,11 @@ int bla_init(struct bat_priv *bat_priv)
         if (!bat_priv->claim_hash || !bat_priv->backbone_hash)
                 return -1;
 
+        batadv_hash_set_lock_class(bat_priv->claim_hash,
+                                   &claim_hash_lock_class_key);
+        batadv_hash_set_lock_class(bat_priv->backbone_hash,
+                                   &backbone_hash_lock_class_key);
+
         bat_dbg(DBG_BLA, bat_priv, "bla hashes initialized\n");
 
         bla_start_timer(bat_priv);
diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
index 117687bedf25..5b2eabe7c4e0 100644
--- a/net/batman-adv/hash.c
+++ b/net/batman-adv/hash.c
@@ -69,3 +69,12 @@ free_hash:
         kfree(hash);
         return NULL;
 }
+
+void batadv_hash_set_lock_class(struct hashtable_t *hash,
+                                struct lock_class_key *key)
+{
+        uint32_t i;
+
+        for (i = 0; i < hash->size; i++)
+                lockdep_set_class(&hash->list_locks[i], key);
+}
diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index d4bd7862719b..93b3c71aeaf8 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -45,6 +45,10 @@ struct hashtable_t {
 /* allocates and clears the hash */
 struct hashtable_t *hash_new(uint32_t size);
 
+/* set class key for all locks */
+void batadv_hash_set_lock_class(struct hashtable_t *hash,
+                                struct lock_class_key *key);
+
 /* free only the hashtable and the hash itself. */
 void hash_destroy(struct hashtable_t *hash);