[PATCH 28/28] PCI: Remove pci_bus_assign_domain_nr()

[Yijing Wang]

Now we save the domain number in pci_host_bridge,
we could remove pci_bus_assign_domain_nr() and
clean the domain member in pci_bus.

Signed-off-by: Yijing Wang <wangyijing at huawei.com>
---
 drivers/pci/pci.c   |   48 +-----------------------------------------------
 drivers/pci/probe.c |   12 ++++--------
 include/linux/pci.h |    3 ---
 3 files changed, 5 insertions(+), 58 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 72232d4..3eb3d8e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4472,6 +4472,7 @@ int pci_domain_nr(struct pci_bus *bus)
 	return host->domain;
 }
 EXPORT_SYMBOL_GPL(pci_domain_nr);
+#endif
 
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
 void pci_host_assign_domain_nr(struct pci_host_bridge *host)
@@ -4519,53 +4520,6 @@ void pci_host_assign_domain_nr(struct pci_host_bridge *host)
 
 	host->domain_nr = domain;
 }
-
-
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
-{
-	static int use_dt_domains = -1;
-	int domain = of_get_pci_domain_nr(parent->of_node);
-
-	/*
-	 * Check DT domain and use_dt_domains values.
-	 *
-	 * If DT domain property is valid (domain >= 0) and
-	 * use_dt_domains != 0, the DT assignment is valid since this means
-	 * we have not previously allocated a domain number by using
-	 * pci_get_new_domain_nr(); we should also update use_dt_domains to
-	 * 1, to indicate that we have just assigned a domain number from
-	 * DT.
-	 *
-	 * If DT domain property value is not valid (ie domain < 0), and we
-	 * have not previously assigned a domain number from DT
-	 * (use_dt_domains != 1) we should assign a domain number by
-	 * using the:
-	 *
-	 * pci_get_new_domain_nr()
-	 *
-	 * API and update the use_dt_domains value to keep track of method we
-	 * are using to assign domain numbers (use_dt_domains = 0).
-	 *
-	 * All other combinations imply we have a platform that is trying
-	 * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
-	 * which is a recipe for domain mishandling and it is prevented by
-	 * invalidating the domain value (domain = -1) and printing a
-	 * corresponding error.
-	 */
-	if (domain >= 0 && use_dt_domains) {
-		use_dt_domains = 1;
-	} else if (domain < 0 && use_dt_domains != 1) {
-		use_dt_domains = 0;
-		domain = pci_get_new_domain_nr();
-	} else {
-		dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
-			parent->of_node->full_name);
-		domain = -1;
-	}
-
-	bus->domain_nr = domain;
-}
-#endif
 #endif
 
 /**
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 0817910..d8b76ef 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -480,7 +480,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
 	}
 }
 
-static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
+static struct pci_bus *pci_alloc_bus(void)
 {
 	struct pci_bus *b;
 
@@ -495,10 +495,7 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
 	INIT_LIST_HEAD(&b->resources);
 	b->max_bus_speed = PCI_SPEED_UNKNOWN;
 	b->cur_bus_speed = PCI_SPEED_UNKNOWN;
-#ifdef CONFIG_PCI_DOMAINS_GENERIC
-	if (parent)
-		b->domain_nr = parent->domain_nr;
-#endif
+
 	return b;
 }
 
@@ -645,7 +642,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
 	/*
 	 * Allocate a new bus, and inherit stuff from the parent..
 	 */
-	child = pci_alloc_bus(parent);
+	child = pci_alloc_bus();
 	if (!child)
 		return NULL;
 
@@ -1865,14 +1862,13 @@ static struct pci_bus *pci_create_root_bus(
 	char *fmt;
 
 	parent = bridge->dev.parent;
-	b = pci_alloc_bus(NULL);
+	b = pci_alloc_bus();
 	if (!b)
 		return NULL;
 
 	b->sysdata = dev_get_drvdata(&bridge->dev);
 	b->ops = ops;
 	b->number = b->busn_res.start = bridge->busnum;
-	pci_bus_assign_domain_nr(b, parent);
 
 	bridge->bus = b;
 	b->bridge = get_device(&bridge->dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e7ca546..ac25d2a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -475,9 +475,6 @@ struct pci_bus {
 	unsigned char	primary;	/* number of primary bridge */
 	unsigned char	max_bus_speed;	/* enum pci_bus_speed */
 	unsigned char	cur_bus_speed;	/* enum pci_bus_speed */
-#ifdef CONFIG_PCI_DOMAINS_GENERIC
-	int		domain_nr;
-#endif
 
 	char		name[48];
 
-- 
1.7.1