[PATCH 6.1.y 4/4] ACPI: property: Do not pass NULL handles to acpi_attach_data()

[Sasha Levin <sashal@kernel.org>]

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

[ Upstream commit baf60d5cb8bc6b85511c5df5f0ad7620bb66d23c ]

In certain circumstances, the ACPI handle of a data-only node may be
NULL, in which case it does not make sense to attempt to attach that
node to an ACPI namespace object, so update the code to avoid attempts
to do so.

This prevents confusing and unuseful error messages from being printed.

Also document the fact that the ACPI handle of a data-only node may be
NULL and when that happens in a code comment.  In addition, make
acpi_add_nondev_subnodes() print a diagnostic message for each data-only
node with an unknown ACPI namespace scope.

Fixes: 1d52f10917a7 ("ACPI: property: Tie data nodes to acpi handles")
Cc: 6.0+ <stable@vger.kernel.org> # 6.0+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/acpi/property.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index af18c939acc3a..46003b642b597 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -112,6 +112,10 @@ static bool acpi_nondev_subnode_extract(union acpi_object *desc,
 		result = true;
 
 	if (result) {
+		/*
+		 * This will be NULL if the desc package is embedded in an outer
+		 * _DSD-equivalent package and its scope cannot be determined.
+		 */
 		dn->handle = handle;
 		dn->data.pointer = desc;
 		list_add_tail(&dn->sibling, list);
@@ -212,6 +216,8 @@ static bool acpi_add_nondev_subnodes(acpi_handle scope,
 			 * strings because there is no way to build full
 			 * pathnames out of them.
 			 */
+			acpi_handle_debug(scope, "subnode %s: Unknown scope\n",
+					  link->package.elements[0].string.pointer);
 			desc = &link->package.elements[1];
 			result = acpi_nondev_subnode_extract(desc, NULL, link,
 							     list, parent);
@@ -384,6 +390,9 @@ static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
 	struct acpi_data_node *dn;
 
 	list_for_each_entry(dn, &data->subnodes, sibling) {
+		if (!dn->handle)
+			continue;
+
 		acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
 
 		acpi_untie_nondev_subnodes(&dn->data);
@@ -398,6 +407,9 @@ static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
 		acpi_status status;
 		bool ret;
 
+		if (!dn->handle)
+			continue;
+
 		status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
 		if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
 			acpi_handle_err(dn->handle, "Can't tag data node\n");
-- 
2.51.0