From ea942b79879f26dbd48cf8a871b6052d0f78de41 Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 25 Mar 2010 12:37:12 +0000
Subject: [PATCH] --- yaml --- r: 189461 b: refs/heads/master c:
 90d2c51dbb4db05c040bc7db264bb7ab35e35455 h: refs/heads/master i:   189459:
 27e25199bdc819f54a6d03699978ae6b90a516ca v: v3

---
 [refs]                       | 2 +-
 trunk/fs/btrfs/extent-tree.c | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 3fd655b319c8..3f1074cfe3ef 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2f3014fc2ab1e25c36531e19164c48182c168995
+refs/heads/master: 90d2c51dbb4db05c040bc7db264bb7ab35e35455
diff --git a/trunk/fs/btrfs/extent-tree.c b/trunk/fs/btrfs/extent-tree.c
index 1727b26fb194..503a18eaef52 100644
--- a/trunk/fs/btrfs/extent-tree.c
+++ b/trunk/fs/btrfs/extent-tree.c
@@ -5205,6 +5205,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
 	next = btrfs_find_tree_block(root, bytenr, blocksize);
 	if (!next) {
 		next = btrfs_find_create_tree_block(root, bytenr, blocksize);
+		if (!next)
+			return -ENOMEM;
 		reada = 1;
 	}
 	btrfs_tree_lock(next);
@@ -5417,7 +5419,8 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
 		if (ret > 0) {
 			path->slots[level]++;
 			continue;
-		}
+		} else if (ret < 0)
+			return ret;
 		level = wc->level;
 	}
 	return 0;