1 files changed, 2 insertions, 1 deletions
diff --git a/block/io.c b/block/io.c
index d76202b..4a59829 100644
--- a/block/io.c
+++ b/block/io.c
@@ -501,7 +501,8 @@ static void dummy_bh_cb(void *opaque)
 
 void bdrv_wakeup(BlockDriverState *bs)
 {
-    if (bs->wakeup) {
+    /* The barrier (or an atomic op) is in the caller.  */
+    if (atomic_read(&bs->wakeup)) {
         aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
     }
 }