Merge tag 'acpi-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix a NULL pointer dereference in the CPPC library code and a
  locking issue related to printing the names of ACPI device nodes in
  the device properties framework.

  Specifics:

   - Fix NULL pointer dereference in the CPPC library code occuring on
     hybrid systems without CPPC support (Rafael Wysocki).

   - Avoid attempts to acquire a semaphore with interrupts off when
     printing the names of ACPI device nodes and clean up code on top of
     that fix (Sakari Ailus)"

* tag 'acpi-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: CPPC: Add NULL pointer check to cppc_get_perf()
  ACPI: Make acpi_node_get_parent() local
  ACPI: Get acpi_device's parent from the parent field

1 files changed, 5 insertions, 9 deletions

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e312ebaed8db..2366f54d8e9c 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1084,21 +1084,17 @@ struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
  * Returns parent node of an ACPI device or data firmware node or %NULL if
  * not available.
  */
-struct fwnode_handle *acpi_node_get_parent(const struct fwnode_handle *fwnode)
+static struct fwnode_handle *
+acpi_node_get_parent(const struct fwnode_handle *fwnode)
 {
 	if (is_acpi_data_node(fwnode)) {
 		/* All data nodes have parent pointer so just return that */
 		return to_acpi_data_node(fwnode)->parent;
 	} else if (is_acpi_device_node(fwnode)) {
-		acpi_handle handle, parent_handle;
-
-		handle = to_acpi_device_node(fwnode)->handle;
-		if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) {
-			struct acpi_device *adev;
+		struct device *dev = to_acpi_device_node(fwnode)->dev.parent;
 
-			if (!acpi_bus_get_device(parent_handle, &adev))
-				return acpi_fwnode_handle(adev);
-		}
+		if (dev)
+			return acpi_fwnode_handle(to_acpi_device(dev));
 	}
 
 	return NULL;