1 files changed, 1 insertions, 0 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 8a8bb8796c6c..72e6d0c55cfa 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -689,6 +689,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
         INIT_RADIX_TREE(&bdi->cgwb_tree, GFP_ATOMIC);
         bdi->cgwb_congested_tree = RB_ROOT;
         mutex_init(&bdi->cgwb_release_mutex);
+        init_rwsem(&bdi->wb_switch_rwsem);
 
         ret = wb_init(&bdi->wb, bdi, 1, GFP_KERNEL);
         if (!ret) {