xen/pcifront: Deprecate pci_get_bus_and_slot()

pci_get_bus_and_slot() is restrictive such that it assumes domain=0 as
where a PCI device is present. This restricts the device drivers to be
reused for other domain numbers.

Use pci_get_domain_bus_and_slot() with a domain number of 0 where we can't
extract the domain number. Other places, use the actual domain number from
the device.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>

drivers/pci/xen-pcifront.c

@@ -595,6 +595,7 @@ static pci_ers_result_t pcifront_common_process(int cmd,
 	struct pci_driver *pdrv;
 	int bus = pdev->sh_info->aer_op.bus;
 	int devfn = pdev->sh_info->aer_op.devfn;
+	int domain = pdev->sh_info->aer_op.domain;
 	struct pci_dev *pcidev;
 	int flag = 0;
 
@@ -603,7 +604,7 @@ static pci_ers_result_t pcifront_common_process(int cmd,
 		cmd, bus, devfn);
 	result = PCI_ERS_RESULT_NONE;
 
-	pcidev = pci_get_bus_and_slot(bus, devfn);
+	pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn);
 	if (!pcidev || !pcidev->driver) {
 		dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
 		pci_dev_put(pcidev);