Commit 8e9028b3 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

PCI: Return NULL for to_pci_driver(NULL) 



to_pci_driver() takes a pointer to a struct device_driver and uses
container_of() to find the struct pci_driver that contains it.

If given a NULL pointer to a struct device_driver, return a NULL pci_driver
pointer instead of applying container_of() to NULL.

This simplifies callers that would otherwise have to check for a NULL
pointer first.

Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent e4e737bb

include/linux/pci.h

+4 −1
Original line number Diff line number Diff line
@@ -900,7 +900,10 @@ struct pci_driver { 
	struct pci_dynids	dynids;

};



#define	to_pci_driver(drv) container_of(drv, struct pci_driver, driver)

static inline struct pci_driver *to_pci_driver(struct device_driver *drv)

{

    return drv ? container_of(drv, struct pci_driver, driver) : NULL;

}



/**

 * PCI_DEVICE - macro used to describe a specific PCI device