Change dm_table_pre/postsuspend_targets to accept NULL.
--- diff/drivers/md/dm-table.c	2005-07-06 18:52:32.000000000 +0100
+++ source/drivers/md/dm-table.c	2005-07-06 18:52:18.000000000 +0100
@@ -869,11 +869,17 @@
 
 void dm_table_presuspend_targets(struct dm_table *t)
 {
+	if (!t)
+		return;
+
 	return suspend_targets(t, 0);
 }
 
 void dm_table_postsuspend_targets(struct dm_table *t)
 {
+	if (!t)
+		return;
+
 	return suspend_targets(t, 1);
 }
 
--- diff/drivers/md/dm.c	2005-07-06 18:52:32.000000000 +0100
+++ source/drivers/md/dm.c	2005-07-06 18:51:45.000000000 +0100
@@ -931,7 +931,7 @@
 	struct dm_table *map = dm_get_table(md);
 
 	if (atomic_dec_and_test(&md->holders)) {
-		if (!dm_suspended(md) && map) {
+		if (!dm_suspended(md)) {
 			dm_table_presuspend_targets(map);
 			dm_table_postsuspend_targets(map);
 		}
@@ -1052,9 +1052,8 @@
 		goto out_read_unlock;
 
 	map = dm_get_table(md);
-	if (map)
-		/* This does not get reverted if there's an error later. */
-		dm_table_presuspend_targets(map);
+	/* This does not get reverted if there's an error later. */
+	dm_table_presuspend_targets(map);
 
 	error = __lock_fs(md);
 	if (error) {
@@ -1112,8 +1111,7 @@
 	set_bit(DMF_SUSPENDED, &md->flags);
 
 	map = dm_get_table(md);
-	if (map)
-		dm_table_postsuspend_targets(map);
+	dm_table_postsuspend_targets(map);
 	dm_table_put(map);
 	up_write(&md->lock);