virtio: virtio 1.0 cs04 spec compliance for reset
[ Upstream commit 05dbcb43 ] The spec says: after writing 0 to device_status, the driver MUST wait for a read of device_status to return 0 before reinitializing the device. Cc: stable@vger.kernel.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
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