diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ffb5fcde54a9..a6c52fb1fe68 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3553,7 +3553,7 @@ static void __add_stripe_bio(struct stripe_head *sh, struct bio *bi,
 		 sh->dev[dd_idx].sector);
 
 	if (conf->mddev->bitmap && firstwrite && !sh->batch_head) {
-		sh->bm_seq = conf->seq_flush+1;
+		sh->bm_seq = READ_ONCE(conf->seq_flush) + 1;
 		set_bit(STRIPE_BIT_DELAY, &sh->state);
 	}
 }
@@ -5799,7 +5799,7 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
 		}
 		spin_unlock_irq(&sh->stripe_lock);
 		if (conf->mddev->bitmap) {
-			sh->bm_seq = conf->seq_flush + 1;
+			sh->bm_seq = READ_ONCE(conf->seq_flush) + 1;
 			set_bit(STRIPE_BIT_DELAY, &sh->state);
 		}
 
@@ -6849,12 +6849,14 @@ static void raid5d(struct md_thread *thread)
 		if (
 		    !list_empty(&conf->bitmap_list)) {
 			/* Now is a good time to flush some bitmap updates */
-			conf->seq_flush++;
+			int seq = conf->seq_flush + 1;
+
+			WRITE_ONCE(conf->seq_flush, seq);
 			spin_unlock_irq(&conf->device_lock);
 			if (md_bitmap_enabled(mddev, true))
 				mddev->bitmap_ops->unplug(mddev, true);
 			spin_lock_irq(&conf->device_lock);
-			conf->seq_write = conf->seq_flush;
+			conf->seq_write = seq;
 			activate_bit_delay(conf, conf->temp_inactive_list);
 		}
 		raid5_activate_delayed(conf);