ACPI: convert acpi_bus_scan() to operate on an acpi_handle

This patch changes acpi_bus_scan() to take an acpi_handle rather than an
acpi_device pointer.  I plan to use acpi_bus_scan() in the hotplug path,
and I'd rather not assume that notifications only go to nodes that already
have acpi_devices.

This will also help remove the special case for adding the root node.  We
currently add the root by hand before acpi_bus_scan(), but using a handle
here means we can start the acpi_bus_scan() directly with the root even
though it doesn't have an acpi_device yet.

Note that acpi_bus_scan() currently adds and/or starts the *children* of
its device argument.  It doesn't do anything with the device itself.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 17 insertions, 17 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index f205b368894b..4fe73596c5d3 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1387,7 +1387,7 @@ end:
         return result;
 }
 
-static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
+static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops)
 {
         acpi_status status = AE_OK;
         struct acpi_device *parent = NULL;
@@ -1396,13 +1396,16 @@ static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
         acpi_handle chandle = NULL;
         acpi_object_type type = 0;
         u32 level = 1;
+        int ret;
 
-
-        if (!start)
-                return -EINVAL;
-
-        parent = start;
-        phandle = start->handle;
+        /*
+         * We must have an acpi_device for the starting node already, and
+         * we scan its children.
+         */
+        phandle = handle;
+        ret = acpi_bus_get_device(phandle, &parent);
+        if (ret)
+                return ret;
 
         /*
          * Parse through the ACPI namespace, identify all 'devices', and
@@ -1516,7 +1519,7 @@ acpi_bus_add(struct acpi_device **child,
 
         result = acpi_add_single_object(child, handle, type, &ops);
         if (!result)
-                result = acpi_bus_scan(*child, &ops);
+                result = acpi_bus_scan((*child)->handle, &ops);
 
         return result;
 }
@@ -1527,16 +1530,13 @@ int acpi_bus_start(struct acpi_device *device)
         int result;
         struct acpi_bus_ops ops;
 
-
-        if (!device)
-                return -EINVAL;
+        memset(&ops, 0, sizeof(ops));
+        ops.acpi_op_start = 1;
 
         result = acpi_start_single_object(device);
-        if (!result) {
-                memset(&ops, 0, sizeof(ops));
-                ops.acpi_op_start = 1;
-                result = acpi_bus_scan(device, &ops);
-        }
+        if (!result)
+                result = acpi_bus_scan(device->handle, &ops);
+
         return result;
 }
 EXPORT_SYMBOL(acpi_bus_start);
@@ -1653,7 +1653,7 @@ int __init acpi_scan_init(void)
         result = acpi_bus_scan_fixed();
 
         if (!result)
-                result = acpi_bus_scan(acpi_root, &ops);
+                result = acpi_bus_scan(acpi_root->handle, &ops);
 
         if (result)
                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);