1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 27506302eb7a..dd59d71ade2f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3834,7 +3834,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
                                 err = -EBUSY;
                 }
                 spin_unlock(&mddev->lock);
-                return err;
+                return err ?: len;
         }
         err = mddev_lock(mddev);
         if (err)