diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 2133085deda7..ddd072cbc738 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -191,10 +191,6 @@ void
 acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
 			    acpi_adr_space_type space_id, u32 function);
 
-void
-acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *node,
-				  acpi_adr_space_type space_id);
-
 acpi_status
 acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function);
 
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index dc6004daf624..18fdf2bc2d49 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -20,6 +20,10 @@ extern u8 acpi_gbl_default_address_spaces[];
 
 /* Local prototypes */
 
+static void
+acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
+				  acpi_adr_space_type space_id);
+
 static acpi_status
 acpi_ev_reg_run(acpi_handle obj_handle,
 		u32 level, void *context, void **return_value);
@@ -814,7 +818,7 @@ acpi_ev_reg_run(acpi_handle obj_handle,
  *
  ******************************************************************************/
 
-void
+static void
 acpi_ev_execute_orphan_reg_method(struct acpi_namespace_node *device_node,
 				  acpi_adr_space_type space_id)
 {
diff --git a/drivers/acpi/acpica/evxfregn.c b/drivers/acpi/acpica/evxfregn.c
index 624361a5f34d..3197e6303c5b 100644
--- a/drivers/acpi/acpica/evxfregn.c
+++ b/drivers/acpi/acpica/evxfregn.c
@@ -306,57 +306,3 @@ acpi_execute_reg_methods(acpi_handle device, acpi_adr_space_type space_id)
 }
 
 ACPI_EXPORT_SYMBOL(acpi_execute_reg_methods)
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_execute_orphan_reg_method
- *
- * PARAMETERS:  device          - Handle for the device
- *              space_id        - The address space ID
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Execute an "orphan" _REG method that appears under an ACPI
- *              device. This is a _REG method that has no corresponding region
- *              within the device's scope.
- *
- ******************************************************************************/
-acpi_status
-acpi_execute_orphan_reg_method(acpi_handle device, acpi_adr_space_type space_id)
-{
-	struct acpi_namespace_node *node;
-	acpi_status status;
-
-	ACPI_FUNCTION_TRACE(acpi_execute_orphan_reg_method);
-
-	/* Parameter validation */
-
-	if (!device) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
-
-	/* Convert and validate the device handle */
-
-	node = acpi_ns_validate_handle(device);
-	if (node) {
-
-		/*
-		 * If an "orphan" _REG method is present in the device's scope
-		 * for the given address space ID, run it.
-		 */
-
-		acpi_ev_execute_orphan_reg_method(node, space_id);
-	} else {
-		status = AE_BAD_PARAMETER;
-	}
-
-	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
-	return_ACPI_STATUS(status);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_execute_orphan_reg_method)
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index a7b59a19f8d9..77db94ab5abe 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1550,9 +1550,6 @@ static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device,
 
 	if (call_reg && !test_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags)) {
 		acpi_execute_reg_methods(scope_handle, ACPI_ADR_SPACE_EC);
-		if (scope_handle != ec->handle)
-			acpi_execute_orphan_reg_method(ec->handle, ACPI_ADR_SPACE_EC);
-
 		set_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags);
 	}
 
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 80dc36f9d527..94d0fc3bd412 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -662,10 +662,6 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			    acpi_execute_reg_methods(acpi_handle device,
 						     acpi_adr_space_type
 						     space_id))
-ACPI_EXTERNAL_RETURN_STATUS(acpi_status
-			    acpi_execute_orphan_reg_method(acpi_handle device,
-							   acpi_adr_space_type
-							   space_id))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			    acpi_remove_address_space_handler(acpi_handle
 							      device,
