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ACPI: property: Tie data nodes to acpi handles

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ACPICA allows associating additional information (i.e. pointers with
specific tag) to acpi_handles. The acpi_device's are associated to
acpi_handle's in acpi_tie_acpi_dev() in scan.c, do the same here for the
_DSD data nodes.

This allows direct data node references in properties, implemented later on
in the series.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2022-07-11 14:26:00 +03:00 committed by Rafael J. Wysocki
parent 85140ef275
commit 1d52f10917
1 changed files with 41 additions and 1 deletions
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42
drivers/acpi/property.c
View file

@ -340,6 +340,43 @@ acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
return props;
}
static void acpi_nondev_subnode_tag(acpi_handle handle, void *context)
{
}
static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
{
struct acpi_data_node *dn;
list_for_each_entry(dn, &data->subnodes, sibling) {
acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
acpi_untie_nondev_subnodes(&dn->data);
}
}
static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
{
struct acpi_data_node *dn;
list_for_each_entry(dn, &data->subnodes, sibling) {
acpi_status status;
bool ret;
status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
if (ACPI_FAILURE(status)) {
acpi_handle_err(dn->handle, "Can't tag data node\n");
return false;
}
ret = acpi_tie_nondev_subnodes(&dn->data);
if (!ret)
return ret;
}
return true;
}
static bool acpi_extract_properties(const union acpi_object *desc,
struct acpi_device_data *data)
{
@ -419,7 +456,9 @@ void acpi_init_properties(struct acpi_device *adev)
&adev->data, acpi_fwnode_handle(adev)))
adev->data.pointer = buf.pointer;
if (!adev->data.pointer) {
if (!adev->data.pointer ||
!acpi_tie_nondev_subnodes(&adev->data)) {
acpi_untie_nondev_subnodes(&adev->data);
acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
ACPI_FREE(buf.pointer);
}
@ -462,6 +501,7 @@ static void acpi_destroy_nondev_subnodes(struct list_head *list)
void acpi_free_properties(struct acpi_device *adev)
{
acpi_untie_nondev_subnodes(&adev->data);
acpi_destroy_nondev_subnodes(&adev->data.subnodes);
ACPI_FREE((void *)adev->data.pointer);
adev->data.of_compatible = NULL;