Index: linux-pm/drivers/acpi/acpica/acevents.h
===================================================================
--- linux-pm.orig/drivers/acpi/acpica/acevents.h
+++ linux-pm/drivers/acpi/acpica/acevents.h
@@ -188,7 +188,7 @@ acpi_ev_detach_region(union acpi_operand
 		      u8 acpi_ns_is_locked);
 
 void
-acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
+acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, u32 max_depth,
 			    acpi_adr_space_type space_id, u32 function);
 
 acpi_status
Index: linux-pm/drivers/acpi/acpica/evregion.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpica/evregion.c
+++ linux-pm/drivers/acpi/acpica/evregion.c
@@ -65,6 +65,7 @@ acpi_status acpi_ev_initialize_op_region
 						acpi_gbl_default_address_spaces
 						[i])) {
 			acpi_ev_execute_reg_methods(acpi_gbl_root_node,
+						    ACPI_UINT32_MAX,
 						    acpi_gbl_default_address_spaces
 						    [i], ACPI_REG_CONNECT);
 		}
@@ -672,6 +673,7 @@ cleanup1:
  * FUNCTION:    acpi_ev_execute_reg_methods
  *
  * PARAMETERS:  node            - Namespace node for the device
+ *              max_depth       - Depth to which search for _REG
  *              space_id        - The address space ID
  *              function        - Passed to _REG: On (1) or Off (0)
  *
@@ -683,7 +685,7 @@ cleanup1:
  ******************************************************************************/
 
 void
-acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
+acpi_ev_execute_reg_methods(struct acpi_namespace_node *node, u32 max_depth,
 			    acpi_adr_space_type space_id, u32 function)
 {
 	struct acpi_reg_walk_info info;
@@ -717,7 +719,7 @@ acpi_ev_execute_reg_methods(struct acpi_
 	 * regions and _REG methods. (i.e. handlers must be installed for all
 	 * regions of this Space ID before we can run any _REG methods)
 	 */
-	(void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
+	(void)acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, max_depth,
 				     ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run, NULL,
 				     &info, NULL);
 
Index: linux-pm/drivers/acpi/acpica/evxfregn.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpica/evxfregn.c
+++ linux-pm/drivers/acpi/acpica/evxfregn.c
@@ -85,7 +85,8 @@ acpi_install_address_space_handler_inter
 	/* Run all _REG methods for this address space */
 
 	if (run_reg) {
-		acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT);
+		acpi_ev_execute_reg_methods(node, ACPI_UINT32_MAX, space_id,
+					    ACPI_REG_CONNECT);
 	}
 
 unlock_and_exit:
@@ -263,6 +264,7 @@ ACPI_EXPORT_SYMBOL(acpi_remove_address_s
  * FUNCTION:    acpi_execute_reg_methods
  *
  * PARAMETERS:  device          - Handle for the device
+ *              max_depth       - Depth to which search for _REG
  *              space_id        - The address space ID
  *
  * RETURN:      Status
@@ -271,7 +273,8 @@ ACPI_EXPORT_SYMBOL(acpi_remove_address_s
  *
  ******************************************************************************/
 acpi_status
-acpi_execute_reg_methods(acpi_handle device, acpi_adr_space_type space_id)
+acpi_execute_reg_methods(acpi_handle device, u32 max_depth,
+			 acpi_adr_space_type space_id)
 {
 	struct acpi_namespace_node *node;
 	acpi_status status;
@@ -296,7 +299,8 @@ acpi_execute_reg_methods(acpi_handle dev
 
 		/* Run all _REG methods for this address space */
 
-		acpi_ev_execute_reg_methods(node, space_id, ACPI_REG_CONNECT);
+		acpi_ev_execute_reg_methods(node, max_depth, space_id,
+					    ACPI_REG_CONNECT);
 	} else {
 		status = AE_BAD_PARAMETER;
 	}
Index: linux-pm/include/acpi/acpixf.h
===================================================================
--- linux-pm.orig/include/acpi/acpixf.h
+++ linux-pm/include/acpi/acpixf.h
@@ -660,6 +660,7 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			     void *context))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			    acpi_execute_reg_methods(acpi_handle device,
+						     u32 nax_depth,
 						     acpi_adr_space_type
 						     space_id))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
Index: linux-pm/drivers/acpi/ec.c
===================================================================
--- linux-pm.orig/drivers/acpi/ec.c
+++ linux-pm/drivers/acpi/ec.c
@@ -1549,7 +1549,7 @@ static int ec_install_handlers(struct ac
 	}
 
 	if (call_reg && !test_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags)) {
-		acpi_execute_reg_methods(scope_handle, ACPI_ADR_SPACE_EC);
+		acpi_execute_reg_methods(scope_handle, ACPI_UINT32_MAX, ACPI_ADR_SPACE_EC);
 		set_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags);
 	}
 
