->sem)
                       -> driver_probe_device(drv, dev)
                          -> dev->bus->probe(dev) (== pci_device_probe)
                             -> _pci_device_probe(drv, pci_dev)
                                -> pci_call_probe(drv, pci_dev, id)
                                   -> drv->probe(dev, id) (== cp_init_one)
                                [...]
                                pci_dev->driver = drv;

   2.3) suspend_device (takes (device *)->sem)
        -> dev->bus->suspend(dev) (== pci_device_suspend)
           checking for drv = pci_dev->driver != NULL
           [...]
           -> drv->suspend(pci_dev, state) (== cp_suspend)

dev->sem and the state of pci_dev->driver provide the expected result.

St Mary's day was a bit rainy here.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>