[PATCH V9 06/11] PCI: Refactor generic bus domain assignment

[Tomasz Nowicki <tn@semihalf.com>]

Change the way PCI bus domain number is assigned and improve function
name to reflect what function does. No functional changes.

Instead of assigning bus domain number inside of pci_bus_assign_domain_nr()
simply return domain number and let pci_create_root_bus() do assignment.
This way pci_create_root_bus() setups bus structure data in the consistent
way. Since pci_bus_assign_domain_nr() now does not assign but retrieves
domain number instead, rename it to pci_bus_find_domain_nr().

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
---
 drivers/pci/pci.c   | 4 ++--
 drivers/pci/probe.c | 4 +++-
 include/linux/pci.h | 7 +------
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index eb431b5..b9a7833 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4941,7 +4941,7 @@ int pci_get_new_domain_nr(void)
 }
 
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent)
 {
 	static int use_dt_domains = -1;
 	int domain = -1;
@@ -4985,7 +4985,7 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
 		domain = -1;
 	}
 
-	bus->domain_nr = domain;
+	return domain;
 }
 #endif
 #endif
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8e3ef72..380d46d 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2127,7 +2127,9 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	b->sysdata = sysdata;
 	b->ops = ops;
 	b->number = b->busn_res.start = bus;
-	pci_bus_assign_domain_nr(b, parent);
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+	b->domain_nr = pci_bus_find_domain_nr(b, parent);
+#endif
 	b2 = pci_find_bus(pci_domain_nr(b), bus);
 	if (b2) {
 		/* If we already got to this bus through a different bridge, ignore it */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index ce03d65..48839e8 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1390,12 +1390,7 @@ static inline int pci_domain_nr(struct pci_bus *bus)
 {
 	return bus->domain_nr;
 }
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent);
-#else
-static inline void pci_bus_assign_domain_nr(struct pci_bus *bus,
-					struct device *parent)
-{
-}
+int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent);
 #endif
 
 /* some architectures require additional setup to direct VGA traffic */
-- 
1.9.1