Btrfs: make sure btrfs_remove_free_space doesn't leak EAGAIN

btrfs_remove_free_space needs to make sure to set ret back to a
valid return value after setting it to EAGAIN, otherwise we return
it to the callers.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index de205d59b74b..f49475dfa954 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1868,6 +1868,7 @@ again:
                         ctl->total_bitmaps--;
                 }
                 kmem_cache_free(btrfs_free_space_cachep, info);
+                ret = 0;
                 goto out_lock;
         }
 
@@ -1875,7 +1876,8 @@ again:
                 unlink_free_space(ctl, info);
                 info->offset += bytes;
                 info->bytes -= bytes;
-                link_free_space(ctl, info);
+                ret = link_free_space(ctl, info);
+                WARN_ON(ret);
                 goto out_lock;
         }