From dec05074b1a322f5fbbe3f81bc438a75bfec3c34 Mon Sep 17 00:00:00 2001
From: Antonio Quartulli <ordex@autistici.org>
Date: Sat, 10 Nov 2012 11:00:32 +0100
Subject: [PATCH] batman-adv: Initialize lockdep class keys for hashes
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Different hashes have the same class key because they get
initialised with the same one. For this reason lockdep can create
false warning when they are used recursively.

Re-initialise the key for each hash after the invocation to hash_new()
to avoid this problem.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Tested-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/originator.c        |  6 ++++++
 net/batman-adv/translation-table.c | 10 ++++++++++
 net/batman-adv/vis.c               |  6 ++++++
 3 files changed, 22 insertions(+)

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 8c32cf1c2dec..109081c49bbd 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -29,6 +29,9 @@
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
 
+/* hash class keys */
+static struct lock_class_key batadv_orig_hash_lock_class_key;
+
 static void batadv_purge_orig(struct work_struct *work);
 
 static void batadv_start_purge_timer(struct batadv_priv *bat_priv)
@@ -57,6 +60,9 @@ int batadv_originator_init(struct batadv_priv *bat_priv)
 	if (!bat_priv->orig_hash)
 		goto err;
 
+	batadv_hash_set_lock_class(bat_priv->orig_hash,
+				   &batadv_orig_hash_lock_class_key);
+
 	batadv_start_purge_timer(bat_priv);
 	return 0;
 
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 5f442328f2e6..c6fd0b760d3e 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -29,6 +29,10 @@
 
 #include <linux/crc16.h>
 
+/* hash class keys */
+static struct lock_class_key batadv_tt_local_hash_lock_class_key;
+static struct lock_class_key batadv_tt_global_hash_lock_class_key;
+
 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
 				 struct batadv_orig_node *orig_node);
 static void batadv_tt_purge(struct work_struct *work);
@@ -235,6 +239,9 @@ static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 	if (!bat_priv->tt.local_hash)
 		return -ENOMEM;
 
+	batadv_hash_set_lock_class(bat_priv->tt.local_hash,
+				   &batadv_tt_local_hash_lock_class_key);
+
 	return 0;
 }
 
@@ -694,6 +701,9 @@ static int batadv_tt_global_init(struct batadv_priv *bat_priv)
 	if (!bat_priv->tt.global_hash)
 		return -ENOMEM;
 
+	batadv_hash_set_lock_class(bat_priv->tt.global_hash,
+				   &batadv_tt_global_hash_lock_class_key);
+
 	return 0;
 }
 
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 0f65a9de5f74..60eb9b7ca8d1 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -28,6 +28,9 @@
 
 #define BATADV_MAX_VIS_PACKET_SIZE 1000
 
+/* hash class keys */
+static struct lock_class_key batadv_vis_hash_lock_class_key;
+
 static void batadv_start_vis_timer(struct batadv_priv *bat_priv);
 
 /* free the info */
@@ -852,6 +855,9 @@ int batadv_vis_init(struct batadv_priv *bat_priv)
 		goto err;
 	}
 
+	batadv_hash_set_lock_class(bat_priv->vis.hash,
+				   &batadv_vis_hash_lock_class_key);
+
 	bat_priv->vis.my_info = kmalloc(BATADV_MAX_VIS_PACKET_SIZE, GFP_ATOMIC);
 	if (!bat_priv->vis.my_info)
 		goto err;