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Subject[PATCH 18/23] PCI, ACPI: add acpi_pci_root_rescan()
Date
it will rescan all acpi pci root if related pci root bus get removed before.

Signed-off-by: Yinghai <yinghai@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
---
drivers/acpi/pci_root.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index b38e347..e1814e0 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -679,3 +679,55 @@ static int __init acpi_pci_root_init(void)
}

subsys_initcall(acpi_pci_root_init);
+
+static acpi_status
+rescan_root_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ struct acpi_device *device, *pdevice;
+ struct acpi_pci_root *root;
+ acpi_handle phandle;
+ int ret_val;
+
+ if (!acpi_is_root_bridge(handle))
+ return AE_OK;
+
+ acpi_get_parent(handle, &phandle);
+ if (acpi_bus_get_device(phandle, &pdevice)) {
+ printk(KERN_DEBUG "no parent device, assuming NULL\n");
+ pdevice = NULL;
+ }
+
+ if (!acpi_bus_get_device(handle, &device)) {
+ /* check if pci root_bus is removed */
+ root = acpi_driver_data(device);
+ if (pci_find_bus(root->segment, root->secondary.start))
+ return AE_OK;
+
+ printk(KERN_DEBUG "bus exists... trim\n");
+ /* this shouldn't be in here, so remove
+ * the bus then re-add it...
+ */
+ ret_val = acpi_bus_trim(device, 1);
+ printk(KERN_DEBUG "acpi_bus_trim return %x\n", ret_val);
+ }
+
+ ret_val = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+ if (ret_val) {
+ printk(KERN_ERR "error adding bus, %x\n", -ret_val);
+ goto out;
+ }
+
+ root = acpi_driver_data(device);
+ pci_assign_unassigned_bus_resources(root->bus);
+
+ ret_val = acpi_bus_start(device);
+
+out:
+ return ret_val;
+}
+
+void acpi_pci_root_rescan(void)
+{
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX, rescan_root_bridge, NULL, NULL, NULL);
+}
--
1.7.7


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