linux-kernel - [PATCH 3/8] PCI, x86: Let pcibios_allocate_bus

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Date:	Sat,  3 Nov 2012 21:39:26 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	x86@...nel.org
Subject: [PATCH 3/8] PCI, x86: Let pcibios_allocate_bus_resources() take bus instead

Will need call the same code for one single root bus during hot add.
So make it take bus instead of bus list.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: x86@...nel.org
---
 arch/x86/pci/i386.c |   38 +++++++++++++++++++++++++-------------
 1 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5817cf2..84696ed 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -215,16 +215,15 @@ static void __init pcibios_allocate_bridge_resources(struct pci_dev *dev)
 	}
 }
 
-static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
+static void __init pcibios_allocate_bus_resources(struct pci_bus *bus)
 {
-	struct pci_bus *bus;
+	struct pci_bus *child;
 
 	/* Depth-First Search on bus tree */
-	list_for_each_entry(bus, bus_list, node) {
-		if (bus->self)
-			pcibios_allocate_bridge_resources(bus->self);
-		pcibios_allocate_bus_resources(&bus->children);
-	}
+	if (bus->self)
+		pcibios_allocate_bridge_resources(bus->self);
+	list_for_each_entry(child, &bus->children, node)
+		pcibios_allocate_bus_resources(child);
 }
 
 struct pci_check_idx_range {
@@ -285,12 +284,18 @@ static void __init pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
 	}
 }
 
-static void __init pcibios_allocate_resources(int pass)
+static void __init pcibios_allocate_resources(struct pci_bus *bus, int pass)
 {
-	struct pci_dev *dev = NULL;
+	struct pci_dev *dev;
+	struct pci_bus *child;
 
-	for_each_pci_dev(dev)
+	list_for_each_entry(dev, &bus->devices, bus_list) {
 		pcibios_allocate_dev_resources(dev, pass);
+
+		child = dev->subordinate;
+		if (child)
+			pcibios_allocate_resources(child, pass);
+	}
 }
 
 static int __init pcibios_assign_resources(void)
@@ -323,10 +328,17 @@ static int __init pcibios_assign_resources(void)
 
 void __init pcibios_resource_survey(void)
 {
+	struct pci_bus *bus;
+
 	DBG("PCI: Allocating resources\n");
-	pcibios_allocate_bus_resources(&pci_root_buses);
-	pcibios_allocate_resources(0);
-	pcibios_allocate_resources(1);
+
+	list_for_each_entry(bus, &pci_root_buses, node)
+		pcibios_allocate_bus_resources(bus);
+
+	list_for_each_entry(bus, &pci_root_buses, node)
+		pcibios_allocate_resources(bus, 0);
+	list_for_each_entry(bus, &pci_root_buses, node)
+		pcibios_allocate_resources(bus, 1);
 
 	e820_reserve_resources_late();
 	/*
-- 
1.7.7

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