pci_cfg_access_trylock(9) centos man page | unix.com

PCI_CFG_ACCESS_TRYLO(9) 					Hardware Interfaces					   PCI_CFG_ACCESS_TRYLO(9)

NAME
       pci_cfg_access_trylock - try to lock PCI config reads/writes

SYNOPSIS
       bool pci_cfg_access_trylock(struct pci_dev * dev);

ARGUMENTS
       dev
	   pci device struct

DESCRIPTION
       Same as pci_cfg_access_lock, but will return 0 if access is already locked, 1 otherwise. This function can be used from atomic contexts.

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Kernel Hackers Manual 3.10					     June 2014						   PCI_CFG_ACCESS_TRYLO(9)