rb_node returned by __tree_search() can be a valid pointer or NULL,
but won't be some errno.
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
fs/btrfs/extent_map.c | 17 +++--------------
1 files changed, 3 insertions(+), 14 deletions(-)
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2d04103..911a9db 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -379,23 +379,12 @@ struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
em = rb_entry(next, struct extent_map, rb_node);
goto found;
}
- if (!rb_node) {
- em = NULL;
- goto out;
- }
- if (IS_ERR(rb_node)) {
- em = ERR_CAST(rb_node);
- goto out;
- }
- em = rb_entry(rb_node, struct extent_map, rb_node);
- goto found;
-
- em = NULL;
- goto out;
+ if (!rb_node)
+ return NULL;
+ em = rb_entry(rb_node, struct extent_map, rb_node);
found:
atomic_inc(&em->refs);
-out:
return em;
}
--
1.7.3.1
--
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