Btrfs: don't call free_extent_buffer twice in iterate_irefs

Avoid calling free_extent_buffer more than once when the iterator function
returns non-zero. The only code that uses this is scrub repair for corrupted
nodatasum blocks.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b332ff04c5ee..fb56bcc80377 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1247,7 +1247,7 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
                                 struct btrfs_path *path,
                                 iterate_irefs_t *iterate, void *ctx)
 {
-        int ret;
+        int ret = 0;
         int slot;
         u32 cur;
         u32 len;
@@ -1259,7 +1259,7 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
         struct btrfs_inode_ref *iref;
         struct btrfs_key found_key;
 
-        while (1) {
+        while (!ret) {
                 ret = inode_ref_info(inum, parent ? parent+1 : 0, fs_root, path,
                                         &found_key);
                 if (ret < 0)
@@ -1288,10 +1288,8 @@ static int iterate_irefs(u64 inum, struct btrfs_root *fs_root,
                                  (unsigned long long)found_key.objectid,
                                  (unsigned long long)fs_root->objectid);
                         ret = iterate(parent, iref, eb, ctx);
-                        if (ret) {
-                                free_extent_buffer(eb);
+                        if (ret)
                                 break;
-                        }
                         len = sizeof(*iref) + name_len;
                         iref = (struct btrfs_inode_ref *)((char *)iref + len);
                 }