From 8e029bf0a611ea3995bd1fae0285cbaf6eed7f16 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 21 Sep 2009 19:29:40 +0000 Subject: 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 Signed-off-by: Len Brown --- drivers/acpi/scan.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) (limited to 'drivers/acpi/scan.c') diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index f205b368894..4fe73596c5d 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); -- cgit v1.2.3