1 files changed, 5 insertions, 3 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bd48bf21118e..8140cb01951f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3615,11 +3615,11 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
         }
 
         while ((node = rb_first(&delayed_refs->root)) != NULL) {
-                ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+                struct btrfs_delayed_ref_head *head = NULL;
 
+                ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
                 atomic_set(&ref->refs, 1);
                 if (btrfs_delayed_ref_is_head(ref)) {
-                        struct btrfs_delayed_ref_head *head;
 
                         head = btrfs_delayed_node_to_head(ref);
                         if (!mutex_trylock(&head->mutex)) {
@@ -3641,10 +3641,12 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                                 delayed_refs->num_heads_ready--;
                         list_del_init(&head->cluster);
                 }
+
                 ref->in_tree = 0;
                 rb_erase(&ref->rb_node, &delayed_refs->root);
                 delayed_refs->num_entries--;
-
+                if (head)
+                        mutex_unlock(&head->mutex);
                 spin_unlock(&delayed_refs->lock);
                 btrfs_put_delayed_ref(ref);