Initialize device before it's used by a driver.
int pci_enable_device (
|struct pci_dev * dev|
struct pci_dev * dev
PCI device to be initialized
Initialize device before it's used by a driver. Ask low-level code
to enable I/O and memory. Wake up the device if it was suspended.
Beware, this function can fail.
Note we don't actually enable the device many times if we call
this function repeatedly (we just increment the count).