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SubjectRe: [PATCH 1/6] ACPI: Separate adding ACPI device objects from probing ACPI drivers
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On Thursday, December 13, 2012 12:38:01 AM Jiang Liu wrote:
> On 12/10/2012 07:00 AM, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > Currently, as soon as an ACPI device node object (struct acpi_device)
> snip
>
> > @@ -1600,48 +1608,77 @@ static acpi_status acpi_bus_check_add(ac
> > * We may already have an acpi_device from a previous enumeration. If
> > * so, we needn't add it again, but we may still have to start it.
> > */
> > - device = NULL;
> > acpi_bus_get_device(handle, &device);
> > if (ops->acpi_op_add && !device) {
> > - acpi_add_single_object(&device, handle, type, sta, ops);
> > - /* Is the device a known good platform device? */
> > - if (device
> > - && !acpi_match_device_ids(device, acpi_platform_device_ids))
> > - acpi_create_platform_device(device);
> > - }
> > + struct acpi_bus_ops add_ops = *ops;
> >
> > - if (!device)
> > - return AE_CTRL_DEPTH;
> > -
> > - if (ops->acpi_op_start && !(ops->acpi_op_add)) {
> > - status = acpi_start_single_object(device);
> > - if (ACPI_FAILURE(status))
> > + add_ops.acpi_op_match = 0;
> > + acpi_add_single_object(&device, handle, type, sta, &add_ops);
> > + if (!device)
> > return AE_CTRL_DEPTH;
> > +
> > + device->bus_ops.acpi_op_match = 1;
> > }
> >
> > if (!*return_value)
> > *return_value = device;
> > +
> > return AE_OK;
> > }
> >
> > +static acpi_status acpi_bus_probe_start(acpi_handle handle, u32 lvl,
> > + void *context, void **not_used)
> > +{
> > + struct acpi_bus_ops *ops = context;
> > + struct acpi_device *device;
> > + acpi_status status = AE_OK;
> > +
> > + if (acpi_bus_get_device(handle, &device))
> > + return AE_CTRL_DEPTH;
> > +
> > + if (ops->acpi_op_add) {
> > + if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
> > + /* This is a known good platform device. */
> > + acpi_create_platform_device(device);
> > + } else {
> > + int ret = device_attach(&device->dev);
> > + acpi_hot_add_bind(device);
> > + if (ret)
> > + status = AE_CTRL_DEPTH;
> > + }
> > + } else if (ops->acpi_op_start) {
> > + if (ACPI_FAILURE(acpi_start_single_object(device)))
> > + status = AE_CTRL_DEPTH;
> > + }
> > + return status;
> > +}
> > +
> > static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
> > struct acpi_device **child)
> > {
> > - acpi_status status;
> > void *device = NULL;
> > + acpi_status status;
> > + int ret = 0;
> >
> > status = acpi_bus_check_add(handle, 0, ops, &device);
> > - if (ACPI_SUCCESS(status))
> > + if (ACPI_FAILURE(status)) {
> > + ret = -ENODEV;
> > + goto out;
> > + }
> > +
> > + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
> > + acpi_bus_check_add, NULL, ops, &device);
> > + if (device)
> > acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
> > - acpi_bus_check_add, NULL, ops, &device);
> > + acpi_bus_probe_start, NULL, ops, NULL);
> Hi Rafael,
> Should we call acpi_bus_probe_start for the top device corresponding to
> "handle" too here?

Do you mean separately? I don't think so. It will be covered by the namespace
walking, won't it?

Rafael


--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.


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