On Wed, 27 Jun 2007 14:34:03 -0400 H. Peter Anvin wrote:
> Alan Cox wrote:
> > On Wed, 27 Jun 2007 10:54:30 -0600
> > Matthew Wilcox <[email protected]> wrote:
> >
> >> On Wed, Jun 27, 2007 at 12:41:41PM -0400, H. Peter Anvin wrote:
> >>> Note that EDD has no way of referencing anything but the zero domain
> >>> (which is presumably the one which is addressed by I/O ports CF8/CFC on
> >>> the BSP.) So in this particular case I would say pci_get_bus_and_slot()
> >>> is fine.
> >> Except that you're not guaranteed to get the bus that's in domain zero.
> >
> > Which is trivial to fix
>
> Yes, and that's probably the only sane definition of that API.
Is this what you mean?
---
From: Randy Dunlap <[email protected]>
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 <[email protected]>
---
drivers/pci/search.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- linux-2622-rc6mm1.orig/drivers/pci/search.c
+++ linux-2622-rc6mm1/drivers/pci/search.c
@@ -173,12 +173,14 @@ struct pci_dev * pci_get_slot(struct pci
}
/**
- * pci_get_bus_and_slot - locate PCI device from a given PCI slot
+ * pci_get_bus_and_slot - locate PCI device from a given PCI bus & slot
* @bus: number of PCI bus on which desired PCI device resides
* @devfn: encodes number of PCI slot in which the desired PCI
* device resides and the logical device number within that slot
* in case of multi-function devices.
*
+ * Note: the bus/slot search is limited to PCI domain (segment) 0.
+ *
* Given a PCI bus and slot/function number, the desired PCI device
* is located in system global list of PCI devices. If the device
* is found, a pointer to its data structure is returned. If no
@@ -191,7 +193,8 @@ struct pci_dev * pci_get_bus_and_slot(un
struct pci_dev *dev = NULL;
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
- if (dev->bus->number == bus && dev->devfn == devfn)
+ if (pci_domain_nr(dev->bus) == 0 &&
+ (dev->bus->number == bus && dev->devfn == devfn))
return dev;
}
return NULL;
-
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