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PCI: limit pci_get_bus_and_slot to domain 0
Limit pci_get_bus_and_slot() to domain (segment) 0 since domain is not specified in the function call and defaulting to domain 0 is the only reasonable thing to do (rather than returning a device from some other unknown domain). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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1 changed files with 5 additions and 2 deletions
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@ -139,12 +139,14 @@ struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn)
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}
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/**
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* pci_get_bus_and_slot - locate PCI device from a given PCI slot
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* pci_get_bus_and_slot - locate PCI device from a given PCI bus & slot
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* @bus: number of PCI bus on which desired PCI device resides
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* @devfn: encodes number of PCI slot in which the desired PCI
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* device resides and the logical device number within that slot
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* in case of multi-function devices.
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*
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* Note: the bus/slot search is limited to PCI domain (segment) 0.
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*
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* Given a PCI bus and slot/function number, the desired PCI device
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* is located in system global list of PCI devices. If the device
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* is found, a pointer to its data structure is returned. If no
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@ -157,7 +159,8 @@ struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn)
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struct pci_dev *dev = NULL;
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while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
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if (dev->bus->number == bus && dev->devfn == devfn)
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if (pci_domain_nr(dev->bus) == 0 &&
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(dev->bus->number == bus && dev->devfn == devfn))
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return dev;
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}
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return NULL;
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