centos man page for pci_dev_present

PCI_DEV_PRESENT(9)						Hardware Interfaces						PCI_DEV_PRESENT(9)

NAME
       pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.

SYNOPSIS
       int pci_dev_present(const struct pci_device_id * ids);

ARGUMENTS
       ids
	   A pointer to a null terminated list of struct pci_device_id structures that describe the type of PCI device the caller is trying to
	   find.

OBVIOUS FACT
       You do not have a reference to any device that might be found by this function, so if that device is removed from the system right after
       this function is finished, the value will be stale. Use this function to find devices that are usually built into a system, or for a
       general hint as to if another device happens to be present at this specific moment in time.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							PCI_DEV_PRESENT(9)