[PATCH v2 33/37] x86, PCI: Add pcibios_root_rescan()

[Yinghai Lu]

Need use it to rescan root bus that was not added via acpi probe.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 arch/x86/include/asm/pci.h |    2 ++
 arch/x86/pci/legacy.c      |   25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index bb015c7..332c191 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -30,6 +30,8 @@ extern struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops,
 					    int node);
 extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);
 
+void pcibios_root_rescan(void);
+
 #ifdef CONFIG_PCI
 
 #ifdef CONFIG_PCI_DOMAINS
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index aab0e41..251f838 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -79,3 +79,28 @@ int __init pci_subsys_init(void)
 	return 0;
 }
 subsys_initcall(pci_subsys_init);
+
+void __ref pcibios_root_rescan(void)
+{
+	int busn;
+	struct pci_bus *bus;
+
+	if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
+		return;
+
+	for (busn = 0; busn <= pcibios_last_bus; busn++) {
+		bus = pci_find_bus(0, busn);
+
+		if (bus)
+			continue;
+
+		bus = __pcibios_scan_specific_bus(busn, false);
+
+		if (!bus)
+			continue;
+
+		pci_assign_unassigned_bus_resources(bus);
+
+		pci_bus_add_devices(bus);
+	}
+}
-- 
1.7.7

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