1 files changed, 71 insertions, 0 deletions
diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
new file mode 100644
index 00000000..117687be
--- /dev/null
+++ b/net/batman-adv/hash.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2006-2012 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "hash.h"
+
+/* clears the hash */
+static void hash_init(struct hashtable_t *hash)
+{
+	uint32_t i;
+
+	for (i = 0 ; i < hash->size; i++) {
+		INIT_HLIST_HEAD(&hash->table[i]);
+		spin_lock_init(&hash->list_locks[i]);
+	}
+}
+
+/* free only the hashtable and the hash itself. */
+void hash_destroy(struct hashtable_t *hash)
+{
+	kfree(hash->list_locks);
+	kfree(hash->table);
+	kfree(hash);
+}
+
+/* allocates and clears the hash */
+struct hashtable_t *hash_new(uint32_t size)
+{
+	struct hashtable_t *hash;
+
+	hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
+	if (!hash)
+		return NULL;
+
+	hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
+	if (!hash->table)
+		goto free_hash;
+
+	hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
+				   GFP_ATOMIC);
+	if (!hash->list_locks)
+		goto free_table;
+
+	hash->size = size;
+	hash_init(hash);
+	return hash;
+
+free_table:
+	kfree(hash->table);
+free_hash:
+	kfree(hash);
+	return NULL;
+}