From 6e8014947d6469df1566e9e253805557c5c0e4e0 Mon Sep 17 00:00:00 2001
From: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Date: Wed, 19 Oct 2011 10:28:26 +0200
Subject: [PATCH] batman-adv: add sanity check when removing global tts

After removing the batman-adv module, the hash may be already gone
when tt_global_del_orig() tries to clean the hash. This patch adds
a sanity check to avoid this.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Tested-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index ca537ed2dd0..d58fd8b9c81 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -698,6 +698,9 @@ void tt_global_del_orig(struct bat_priv *bat_priv,
 	struct hlist_head *head;
 	spinlock_t *list_lock; /* protects write access to the hash lists */
 
+	if (!hash)
+		return;
+
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
 		list_lock = &hash->list_locks[i];