set_backend_state
static void set_backend_state(struct backend_info *be,
set_backend_state(be, XenbusStateInitWait);
set_backend_state(be, XenbusStateConnected);
set_backend_state(be, XenbusStateClosing);
set_backend_state(be, XenbusStateClosed);
set_backend_state(be, XenbusStateClosed);
set_backend_state(dev, XenbusStateInitWait);
set_backend_state(dev, XenbusStateConnected);
set_backend_state(dev, XenbusStateClosing);
set_backend_state(dev, XenbusStateClosed);
set_backend_state(dev, XenbusStateClosed);