Commit 8e029bf0 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Len Brown
Browse files

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: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 5c478f49

drivers/acpi/scan.c

+17 −17
Original line number Diff line number Diff line
@@ -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;



	result = acpi_start_single_object(device);

	if (!result) {

	memset(&ops, 0, sizeof(ops));

	ops.acpi_op_start = 1;

		result = acpi_bus_scan(device, &ops);

	}



	result = acpi_start_single_object(device);

	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);

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