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batman-adv: Initialize lockdep class keys for hashes

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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>
This commit is contained in:
Sven Eckelmann
2012-03-29 12:38:20 +02:00
committed by Antonio Quartulli
parent d2b6cc8e46
commit 5d52dad27a
3 changed files with 26 additions and 0 deletions
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13
net/batman-adv/bridge_loop_avoidance.c
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@@ -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);