pci_dev_get (9) - Linux Manuals
pci_dev_get: increments the reference count of the pci device structure
pci_dev_get - increments the reference count of the pci device structure
struct pci_dev * pci_dev_get(struct pci_dev
- the device being referenced
Each live reference to a device should be refcounted.
Drivers for PCI devices should normally record such references in their probe methods, when they bind to a device, and release them by calling pci_dev_put, in their disconnect methods.