1 files changed, 4 insertions, 0 deletions
diff --git a/block/null.c b/block/null.c
index 356209a42b..5eb2038f62 100644
--- a/block/null.c
+++ b/block/null.c
@@ -134,7 +134,11 @@ static const AIOCBInfo null_aiocb_info = {
 static void null_bh_cb(void *opaque)
 {
     NullAIOCB *acb = opaque;
+    AioContext *ctx = bdrv_get_aio_context(acb->common.bs);
+
+    aio_context_acquire(ctx);
     acb->common.cb(acb->common.opaque, 0);
+    aio_context_release(ctx);
     qemu_aio_unref(acb);
 }