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
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>