1 files changed, 10 insertions, 1 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e86733a8b344..f128b3becfe1 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2476,7 +2476,16 @@ static void insert_wq_barrier(struct pool_workqueue *pwq,
          */
         INIT_WORK_ONSTACK(&barr->work, wq_barrier_func);
         __set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&barr->work));
-        init_completion(&barr->done);
+
+        /*
+         * Explicitly init the crosslock for wq_barrier::done, make its lock
+         * key a subkey of the corresponding work. As a result we won't
+         * build a dependency between wq_barrier::done and unrelated work.
+         */
+        lockdep_init_map_crosslock((struct lockdep_map *)&barr->done.map,
+                                   "(complete)wq_barr::done",
+                                   target->lockdep_map.key, 1);
+        __init_completion(&barr->done);
         barr->task = current;
 
         /*