Btrfs: very minimal locking

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c86f0e6152f2..9583a9ae8b79 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -168,9 +168,10 @@ static int pin_down_block(struct btrfs_root *root, u64 blocknr, int tag)
         BUG_ON(!bh);
         err = radix_tree_insert(&root->fs_info->pinned_radix,
                                 blocknr, bh);
-        BUG_ON(err);
-        if (err)
+        if (err && err != -EEXIST) {
+                BUG();
                 return err;
+        }
         radix_tree_tag_set(&root->fs_info->pinned_radix, blocknr,
                            tag);
         return 0;