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-rw-r--r--drivers/acpi/pci_root.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 7928d4dc7056..dcbe9660e756 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -650,8 +650,10 @@ 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)