[PATCH 8/8] PCI, ACPI: reserve fw allocated resource for hot added root bus

[Yinghai Lu]

FW could already allocate resource in pci bar registers, and we need to
reserve it before try to allocate another one.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
 drivers/acpi/pci_root.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 012f40d..bc09567 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -644,8 +644,10 @@ static int acpi_pci_root_start(struct acpi_device *device)
 	struct acpi_pci_root *root = acpi_driver_data(device);
 	struct acpi_pci_driver *driver;
 
-	if (system_state != SYSTEM_BOOTING)
+	if (system_state != SYSTEM_BOOTING) {
+		pcibios_resource_survey_bus(root->bus);
 		pci_assign_unassigned_bus_resources(root->bus);
+	}
 
 	mutex_lock(&acpi_pci_root_lock);
 	list_for_each_entry(driver, &acpi_pci_drivers, node)
-- 
1.7.7

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