ACPICA: Update internal namespace node/handle interfaces

This change deletes the unnecessary acpi_ns_convert_entry_to_handle
interface and renames the acpi_ns_map_handle_to_node interface to
acpi_ns_validate_handle.  ACPICA BZ 798.

http://www.acpica.org/bugzilla/show_bug.cgi?id=798

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/acnamesp.h

@@ -354,9 +354,7 @@ acpi_ns_externalize_name(u32 internal_name_length,
 			 const char *internal_name,
 			 u32 * converted_name_length, char **converted_name);
 
-struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle);
-
-acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node);
+struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle);
 
 void acpi_ns_terminate(void);
 

drivers/acpi/acpica/evregion.c

@@ -718,7 +718,7 @@ acpi_ev_install_handler(acpi_handle obj_handle,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	if (!node) {
 		return (AE_BAD_PARAMETER);
 	}
@@ -1087,7 +1087,7 @@ acpi_ev_reg_run(acpi_handle obj_handle,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	if (!node) {
 		return (AE_BAD_PARAMETER);
 	}

drivers/acpi/acpica/evxface.c

@@ -259,7 +259,7 @@ acpi_install_notify_handler(acpi_handle device,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(device);
+	node = acpi_ns_validate_handle(device);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -425,7 +425,7 @@ acpi_remove_notify_handler(acpi_handle device,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(device);
+	node = acpi_ns_validate_handle(device);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;

drivers/acpi/acpica/evxfevnt.c

@@ -610,7 +610,7 @@ acpi_install_gpe_block(acpi_handle gpe_device,
 		return (status);
 	}
 
-	node = acpi_ns_map_handle_to_node(gpe_device);
+	node = acpi_ns_validate_handle(gpe_device);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -698,7 +698,7 @@ acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
 		return (status);
 	}
 
-	node = acpi_ns_map_handle_to_node(gpe_device);
+	node = acpi_ns_validate_handle(gpe_device);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;

drivers/acpi/acpica/evxfregn.c

@@ -89,7 +89,7 @@ acpi_install_address_space_handler(acpi_handle device,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(device);
+	node = acpi_ns_validate_handle(device);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -155,7 +155,7 @@ acpi_remove_address_space_handler(acpi_handle device,
 
 	/* Convert and validate the device handle */
 
-	node = acpi_ns_map_handle_to_node(device);
+	node = acpi_ns_validate_handle(device);
 	if (!node ||
 	    ((node->type != ACPI_TYPE_DEVICE) &&
 	     (node->type != ACPI_TYPE_PROCESSOR) &&

drivers/acpi/acpica/nsdump.c

@@ -180,7 +180,7 @@ acpi_ns_dump_one_object(acpi_handle obj_handle,
 		return (AE_OK);
 	}
 
-	this_node = acpi_ns_map_handle_to_node(obj_handle);
+	this_node = acpi_ns_validate_handle(obj_handle);
 	if (!this_node) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid object handle %p\n",
 				  obj_handle));

drivers/acpi/acpica/nsnames.c

@@ -232,7 +232,7 @@ acpi_ns_handle_to_pathname(acpi_handle target_handle,
 
 	ACPI_FUNCTION_TRACE_PTR(ns_handle_to_pathname, target_handle);
 
-	node = acpi_ns_map_handle_to_node(target_handle);
+	node = acpi_ns_validate_handle(target_handle);
 	if (!node) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}

drivers/acpi/acpica/nsutils.c

@@ -671,24 +671,25 @@ acpi_ns_externalize_name(u32 internal_name_length,
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_ns_map_handle_to_node
+ * FUNCTION:    acpi_ns_validate_handle
  *
- * PARAMETERS:  Handle          - Handle to be converted to an Node
+ * PARAMETERS:  Handle          - Handle to be validated and typecast to a
+ *                                namespace node.
  *
- * RETURN:      A Name table entry pointer
+ * RETURN:      A pointer to a namespace node
  *
- * DESCRIPTION: Convert a namespace handle to a real Node
+ * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
+ *              cases for the root node.
  *
- * Note: Real integer handles would allow for more verification
+ * NOTE: Real integer handles would allow for more verification
  *       and keep all pointers within this subsystem - however this introduces
- *       more (and perhaps unnecessary) overhead.
- *
- * The current implemenation is basically a placeholder until such time comes
- * that it is needed.
+ *       more overhead and has not been necessary to this point. Drivers
+ *       holding handles are typically notified before a node becomes invalid
+ *       due to a table unload.
  *
  ******************************************************************************/
 
-struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
+struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
 {
 
 	ACPI_FUNCTION_ENTRY();
@@ -708,42 +709,6 @@ struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
 	return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
 }
 
-/*******************************************************************************
- *
- * FUNCTION:    acpi_ns_convert_entry_to_handle
- *
- * PARAMETERS:  Node          - Node to be converted to a Handle
- *
- * RETURN:      A user handle
- *
- * DESCRIPTION: Convert a real Node to a namespace handle
- *
- ******************************************************************************/
-
-acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
-{
-
-	/*
-	 * Simple implementation for now;
-	 */
-	return ((acpi_handle) node);
-
-/* Example future implementation ---------------------
-
-	if (!Node)
-	{
-		return (NULL);
-	}
-
-	if (Node == acpi_gbl_root_node)
-	{
-		return (ACPI_ROOT_OBJECT);
-	}
-
-	return ((acpi_handle) Node);
-------------------------------------------------------*/
-}
-
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ns_terminate

drivers/acpi/acpica/nsxfeval.c

@@ -190,7 +190,7 @@ acpi_evaluate_object(acpi_handle handle,
 
 	/* Convert and validate the device handle */
 
-	info->prefix_node = acpi_ns_map_handle_to_node(handle);
+	info->prefix_node = acpi_ns_validate_handle(handle);
 	if (!info->prefix_node) {
 		status = AE_BAD_PARAMETER;
 		goto cleanup;
@@ -552,7 +552,7 @@ acpi_ns_get_device_callback(acpi_handle obj_handle,
 		return (status);
 	}
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 	if (ACPI_FAILURE(status)) {
 		return (status);
@@ -729,7 +729,7 @@ acpi_attach_data(acpi_handle obj_handle,
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -775,7 +775,7 @@ acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler)
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -822,7 +822,7 @@ acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data)
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(obj_handle);
+	node = acpi_ns_validate_handle(obj_handle);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;

drivers/acpi/acpica/nsxfname.c

@@ -93,7 +93,7 @@ acpi_get_handle(acpi_handle parent,
 	/* Convert a parent handle to a prefix node */
 
 	if (parent) {
-		prefix_node = acpi_ns_map_handle_to_node(parent);
+		prefix_node = acpi_ns_validate_handle(parent);
 		if (!prefix_node) {
 			return (AE_BAD_PARAMETER);
 		}
@@ -114,7 +114,7 @@ acpi_get_handle(acpi_handle parent,
 
 		if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
 			*ret_handle =
-			    acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
+			    ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 			return (AE_OK);
 		}
 	} else if (!prefix_node) {
@@ -129,7 +129,7 @@ acpi_get_handle(acpi_handle parent,
 	status =
 	    acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 	if (ACPI_SUCCESS(status)) {
-		*ret_handle = acpi_ns_convert_entry_to_handle(node);
+		*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 	}
 
 	return (status);
@@ -186,7 +186,7 @@ acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 		return (status);
 	}
 
-	node = acpi_ns_map_handle_to_node(handle);
+	node = acpi_ns_validate_handle(handle);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -291,7 +291,7 @@ acpi_get_object_info(acpi_handle handle,
 		goto cleanup;
 	}
 
-	node = acpi_ns_map_handle_to_node(handle);
+	node = acpi_ns_validate_handle(handle);
 	if (!node) {
 		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 		return (AE_BAD_PARAMETER);

drivers/acpi/acpica/nsxfobj.c

@@ -79,7 +79,7 @@ acpi_status acpi_get_id(acpi_handle handle, acpi_owner_id * ret_id)
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(handle);
+	node = acpi_ns_validate_handle(handle);
 	if (!node) {
 		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 		return (AE_BAD_PARAMETER);
@@ -132,7 +132,7 @@ acpi_status acpi_get_type(acpi_handle handle, acpi_object_type * ret_type)
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(handle);
+	node = acpi_ns_validate_handle(handle);
 	if (!node) {
 		(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 		return (AE_BAD_PARAMETER);
@@ -182,7 +182,7 @@ acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 
 	/* Convert and validate the handle */
 
-	node = acpi_ns_map_handle_to_node(handle);
+	node = acpi_ns_validate_handle(handle);
 	if (!node) {
 		status = AE_BAD_PARAMETER;
 		goto unlock_and_exit;
@@ -191,7 +191,7 @@ acpi_status acpi_get_parent(acpi_handle handle, acpi_handle * ret_handle)
 	/* Get the parent entry */
 
 	parent_node = acpi_ns_get_parent_node(node);
-	*ret_handle = acpi_ns_convert_entry_to_handle(parent_node);
+	*ret_handle = ACPI_CAST_PTR(acpi_handle, parent_node);
 
 	/* Return exception if parent is null */
 
@@ -251,7 +251,7 @@ acpi_get_next_object(acpi_object_type type,
 
 		/* Start search at the beginning of the specified scope */
 
-		parent_node = acpi_ns_map_handle_to_node(parent);
+		parent_node = acpi_ns_validate_handle(parent);
 		if (!parent_node) {
 			status = AE_BAD_PARAMETER;
 			goto unlock_and_exit;
@@ -260,7 +260,7 @@ acpi_get_next_object(acpi_object_type type,
 		/* Non-null handle, ignore the parent */
 		/* Convert and validate the handle */
 
-		child_node = acpi_ns_map_handle_to_node(child);
+		child_node = acpi_ns_validate_handle(child);
 		if (!child_node) {
 			status = AE_BAD_PARAMETER;
 			goto unlock_and_exit;
@@ -276,7 +276,7 @@ acpi_get_next_object(acpi_object_type type,
 	}
 
 	if (ret_handle) {
-		*ret_handle = acpi_ns_convert_entry_to_handle(node);
+		*ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 	}
 
       unlock_and_exit:

drivers/acpi/acpica/rsxface.c

@@ -104,7 +104,7 @@ acpi_rs_validate_parameters(acpi_handle device_handle,
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	node = acpi_ns_map_handle_to_node(device_handle);
+	node = acpi_ns_validate_handle(device_handle);
 	if (!node) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}