Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

Pull btrfs updates from Chris Mason:
 "I have two additional and btrfs fixes in my for-linus branch.  One is
  a casting error that leads to memory corruption on i386 during scrub,
  and the other fixes a corner case in the backref walking code (also
  triggered by scrub)."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix casting error in scrub reada code
  btrfs: fix locking issues in find_parent_nodes()

fs/btrfs/backref.c

@@ -583,7 +583,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 	struct btrfs_path *path;
 	struct btrfs_key info_key = { 0 };
 	struct btrfs_delayed_ref_root *delayed_refs = NULL;
-	struct btrfs_delayed_ref_head *head = NULL;
+	struct btrfs_delayed_ref_head *head;
 	int info_level = 0;
 	int ret;
 	struct list_head prefs_delayed;
@@ -607,6 +607,8 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 	 * at a specified point in time
 	 */
 again:
+	head = NULL;
+
 	ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
 	if (ret < 0)
 		goto out;
@@ -635,9 +637,11 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 			goto again;
 		}
 		ret = __add_delayed_refs(head, seq, &info_key, &prefs_delayed);
-		if (ret)
+		if (ret) {
+			spin_unlock(&delayed_refs->lock);
 			goto out;
 		}
+	}
 	spin_unlock(&delayed_refs->lock);
 
 	if (path->slots[0]) {

fs/btrfs/reada.c

@@ -305,7 +305,7 @@ static struct reada_zone *reada_find_zone(struct btrfs_fs_info *fs_info,
 
 	spin_lock(&fs_info->reada_lock);
 	ret = radix_tree_insert(&dev->reada_zones,
-				(unsigned long)zone->end >> PAGE_CACHE_SHIFT,
+				(unsigned long)(zone->end >> PAGE_CACHE_SHIFT),
 				zone);
 	spin_unlock(&fs_info->reada_lock);