ACPI updates for 5.18-rc2

- Revert an ACPI processor driver change related to cache
    invalidation in acpi_idle_play_dead() that clearly was a mistake
    and introduced user-visible regressions (Akihiko Odaki).
 
  - Replace the last instance of acpi_bus_get_device() added during
    the recent merge window and drop the function to prevent more
    users of it from being added (Rafael Wysocki).
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Merge tag 'acpi-5.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These revert a problematic commit from the 5.17 development cycle and
  finalize the elimination of acpi_bus_get_device() that mostly took
  place during the recent merge window.

  Specifics:

   - Revert an ACPI processor driver change related to cache
     invalidation in acpi_idle_play_dead() that clearly was a mistake
     and introduced user-visible regressions (Akihiko Odaki).

   - Replace the last instance of acpi_bus_get_device() added during the
     recent merge window and drop the function to prevent more users of
     it from being added (Rafael Wysocki)"

* tag 'acpi-5.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: bus: Eliminate acpi_bus_get_device()
  Revert "ACPI: processor: idle: Only flush cache on entering C3"

drivers/acpi/processor_idle.c

@@ -570,8 +570,7 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
 
-	if (cx->type == ACPI_STATE_C3)
-		ACPI_FLUSH_CPU_CACHE();
+	ACPI_FLUSH_CPU_CACHE();
 
 	while (1) {
 

drivers/acpi/scan.c

@@ -588,19 +588,6 @@ static struct acpi_device *handle_to_device(acpi_handle handle,
 	return adev;
 }
 
-int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
-{
-	if (!device)
-		return -EINVAL;
-
-	*device = handle_to_device(handle, NULL);
-	if (!*device)
-		return -ENODEV;
-
-	return 0;
-}
-EXPORT_SYMBOL(acpi_bus_get_device);
-
 /**
  * acpi_fetch_acpi_dev - Retrieve ACPI device object.
  * @handle: ACPI handle associated with the requested ACPI device object.

drivers/spi/spi.c

@@ -2410,7 +2410,8 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
 			} else {
 				struct acpi_device *adev;
 
-				if (acpi_bus_get_device(parent_handle, &adev))
+				adev = acpi_fetch_acpi_dev(parent_handle);
+				if (!adev)
 					return -ENODEV;
 
 				ctlr = acpi_spi_find_controller_by_adev(adev);

include/acpi/acpi_bus.h

@@ -509,7 +509,6 @@ extern int unregister_acpi_notifier(struct notifier_block *);
  * External Functions
  */
 
-int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle);
 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 				       unsigned long long *sta);