1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 843b90966920..975dc5a66549 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3849,11 +3849,13 @@ void drbd_queue_bitmap_io(struct drbd_conf *mdev,
         mdev->bm_io_work.done = done;
         mdev->bm_io_work.why = why;
 
+        spin_lock_irq(&mdev->req_lock);
         set_bit(BITMAP_IO, &mdev->flags);
         if (atomic_read(&mdev->ap_bio_cnt) == 0) {
                 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
                         drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
         }
+        spin_unlock_irq(&mdev->req_lock);
 }
 
 /**