totempg: Fix memory leak

Previously there were two free lists. One for operational and one for
transitional state. Because every node starts in transitional state and
always ends in the operational state, assembly was always put to normal
state free list and never in transitional free list, so new assembly
structure was always allocated after new node connected.

Solution is to have only one free list.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Steven Dake <stdake@cisco.com>

exec/totempg.c

@@ -212,12 +212,13 @@ static int callback_token_received_fn (enum totem_callback_token_type type,
 
 DECLARE_LIST_INIT(assembly_list_inuse);
 
+/*
+ * Free list is used both for transitional and operational assemblies
+ */
 DECLARE_LIST_INIT(assembly_list_free);
 
 DECLARE_LIST_INIT(assembly_list_inuse_trans);
 
-DECLARE_LIST_INIT(assembly_list_free_trans);
-
 DECLARE_LIST_INIT(totempg_groups_list);
 
 /*
@@ -291,14 +292,11 @@ static struct assembly *assembly_ref (unsigned int nodeid)
 	struct assembly *assembly;
 	struct list_head *list;
 	struct list_head *active_assembly_list_inuse;
-	struct list_head *active_assembly_list_free;
 
 	if (totempg_waiting_transack) {
 		active_assembly_list_inuse = &assembly_list_inuse_trans;
-		active_assembly_list_free = &assembly_list_free_trans;
 	} else {
 		active_assembly_list_inuse = &assembly_list_inuse;
-		active_assembly_list_free = &assembly_list_free;
 	}
 
 	/*
@@ -318,8 +316,8 @@ static struct assembly *assembly_ref (unsigned int nodeid)
 	/*
 	 * Nothing found in inuse list get one from free list if available
 	 */
-	if (list_empty (active_assembly_list_free) == 0) {
-		assembly = list_entry (active_assembly_list_free->next, struct assembly, list);
+	if (list_empty (&assembly_list_free) == 0) {
+		assembly = list_entry (assembly_list_free.next, struct assembly, list);
 		list_del (&assembly->list);
 		list_add (&assembly->list, active_assembly_list_inuse);
 		assembly->nodeid = nodeid;
@@ -350,33 +348,23 @@ static struct assembly *assembly_ref (unsigned int nodeid)
 
 static void assembly_deref (struct assembly *assembly)
 {
-	struct list_head *active_assembly_list_free;
-
-	if (totempg_waiting_transack) {
-		active_assembly_list_free = &assembly_list_free_trans;
-	} else {
-		active_assembly_list_free = &assembly_list_free;
-	}
 
 	list_del (&assembly->list);
-	list_add (&assembly->list, active_assembly_list_free);
+	list_add (&assembly->list, &assembly_list_free);
 }
 
 static void assembly_deref_from_normal_and_trans (int nodeid)
 {
 	int j;
 	struct list_head *list, *list_next;
 	struct list_head *active_assembly_list_inuse;
-	struct list_head *active_assembly_list_free;
 	struct assembly *assembly;
 
 	for (j = 0; j < 2; j++) {
 		if (j == 0) {
 			active_assembly_list_inuse = &assembly_list_inuse;
-			active_assembly_list_free = &assembly_list_free;
 		} else {
 			active_assembly_list_inuse = &assembly_list_inuse_trans;
-			active_assembly_list_free = &assembly_list_free_trans;
 		}
 
 		for (list = active_assembly_list_inuse->next;
@@ -388,7 +376,7 @@ static void assembly_deref_from_normal_and_trans (int nodeid)
 
 			if (nodeid == assembly->nodeid) {
 				list_del (&assembly->list);
-				list_add (&assembly->list, active_assembly_list_free);
+				list_add (&assembly->list, &assembly_list_free);
 			}
 		}
 	}