virtio-pmem: fix virtio_pmem_resp assign problem

ret in virtio_pmem_resp is a uint32_t variable, which should be assigned
using virtio_stl_p.

The kernel side driver does not guarantee virtio_pmem_resp to be initialized
to zero in advance, So sometimes the flush operation will fail.

Signed-off-by: Wang Liang <wangliangzz@inspur.com>
Message-Id: <20210317024145.271212-1-wangliangzz@126.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/virtio/virtio-pmem.c b/hw/virtio/virtio-pmem.c
index a3e0688a891bc54c7161333c1751c019e62fda9d..d1aeb90a31a6dddb67637c6803860e459ec78cbd 100644 (file)
--- a/hw/virtio/virtio-pmem.c
+++ b/hw/virtio/virtio-pmem.c
@@ -47,7 +47,7 @@ static int worker_cb(void *opaque)
         err = 1;
     }
 
-    virtio_stw_p(req_data->vdev, &req_data->resp.ret, err);
+    virtio_stl_p(req_data->vdev, &req_data->resp.ret, err);
 
     return 0;
 }