find_and_setup_root BUGs when it encounters an error from
 btrfs_find_last_root, which can occur if a path can't be allocated.

 This patch pushes it up to its callers where it is already handled.

Signed-off-by: Jeff Mahoney <[email protected]>
---
 fs/btrfs/disk-io.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1117,10 +1117,10 @@ static int __setup_root(u32 nodesize, u3
        return 0;
 }
 
-static int find_and_setup_root(struct btrfs_root *tree_root,
-                              struct btrfs_fs_info *fs_info,
-                              u64 objectid,
-                              struct btrfs_root *root)
+static int __must_check find_and_setup_root(struct btrfs_root *tree_root,
+                                           struct btrfs_fs_info *fs_info,
+                                           u64 objectid,
+                                           struct btrfs_root *root)
 {
        int ret;
        u32 blocksize;
@@ -1133,7 +1133,8 @@ static int find_and_setup_root(struct bt
                                   &root->root_item, &root->root_key);
        if (ret > 0)
                return -ENOENT;
-       BUG_ON(ret);
+       else if (ret < 0)
+               return ret;
 
        generation = btrfs_root_generation(&root->root_item);
        blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));


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