diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f2d24eb..466a6bf 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1410,6 +1410,7 @@
 	while (1) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
+		smp_mb();
 		if (!atomic_read(&md->pending) || signal_pending(current))
 			break;