disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/acpi/acpica/nsaccess.c
..
..
@@ -36,6 +36,7 @@
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 	acpi_status status;
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 	const struct acpi_predefined_names *init_val = NULL;
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 	struct acpi_namespace_node *new_node;
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+	struct acpi_namespace_node *prev_node = NULL;
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 	union acpi_operand_object *obj_desc;
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 	acpi_string val = NULL;
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..
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@@ -61,12 +62,28 @@
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 	 */
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 	acpi_gbl_root_node = &acpi_gbl_root_node_struct;
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-	/* Enter the pre-defined names in the name table */
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+	/* Enter the predefined names in the name table */
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 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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 			  "Entering predefined entries into namespace\n"));
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69
 
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+	/*
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+	 * Create the initial (default) namespace.
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+	 * This namespace looks like something similar to this:
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+	 *
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+	 *   ACPI Namespace (from Namespace Root):
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+	 *    0  _GPE Scope        00203160 00
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+	 *    0  _PR_ Scope        002031D0 00
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+	 *    0  _SB_ Device       00203240 00 Notify Object: 0020ADD8
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+	 *    0  _SI_ Scope        002032B0 00
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+	 *    0  _TZ_ Device       00203320 00
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+	 *    0  _REV Integer      00203390 00 = 0000000000000002
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+	 *    0  _OS_ String       00203488 00 Len 14 "Microsoft Windows NT"
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+	 *    0  _GL_ Mutex        00203580 00 Object 002035F0
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+	 *    0  _OSI Method       00203678 00 Args 1 Len 0000 Aml 00000000
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+	 */
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 	for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
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+		status = AE_OK;
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 		/* _OSI is optional for now, will be permanent later */
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..
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@@ -75,16 +92,30 @@
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 			continue;
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 		}
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-		status =
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-		    acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name),
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-				   init_val->type, ACPI_IMODE_LOAD_PASS2,
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-				   ACPI_NS_NO_UPSEARCH, NULL, &new_node);
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-		if (ACPI_FAILURE(status)) {
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-			ACPI_EXCEPTION((AE_INFO, status,
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-					"Could not create predefined name %s",
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-					init_val->name));
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-			continue;
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+		/*
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+		 * Create, init, and link the new predefined name
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+		 * Note: No need to use acpi_ns_lookup here because all the
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+		 * predefined names are at the root level. It is much easier to
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+		 * just create and link the new node(s) here.
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+		 */
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+		new_node =
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+		    acpi_ns_create_node(*ACPI_CAST_PTR(u32, init_val->name));
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+		if (!new_node) {
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+			status = AE_NO_MEMORY;
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+			goto unlock_and_exit;
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 		}
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+
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+		new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
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+		new_node->type = init_val->type;
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+
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+		if (!prev_node) {
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+			acpi_gbl_root_node_struct.child = new_node;
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+		} else {
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+			prev_node->peer = new_node;
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+		}
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+
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+		new_node->parent = &acpi_gbl_root_node_struct;
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+		prev_node = new_node;
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119
 
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 		/*
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 		 * Name entered successfully. If entry in pre_defined_names[] specifies
..
..
@@ -131,7 +162,7 @@
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162
 
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 				new_node->value = obj_desc->method.param_count;
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 #else
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-				/* Mark this as a very SPECIAL method */
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+				/* Mark this as a very SPECIAL method (_OSI) */
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 				obj_desc->method.info_flags =
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 				    ACPI_METHOD_INTERNAL_ONLY;
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@@ -267,6 +298,7 @@
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 	acpi_object_type this_search_type;
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 	u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
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 	u32 local_flags;
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+	acpi_interpreter_mode local_interpreter_mode;
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302
 
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 	ACPI_FUNCTION_TRACE(ns_lookup);
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..
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@@ -506,6 +538,7 @@
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 	 */
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 	this_search_type = ACPI_TYPE_ANY;
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 	current_node = this_node;
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+
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 	while (num_segments && current_node) {
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 		num_segments--;
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 		if (!num_segments) {
..
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@@ -536,6 +569,16 @@
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 			}
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 		}
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+		/* Handle opcodes that create a new name_seg via a full name_path */
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+
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+		local_interpreter_mode = interpreter_mode;
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+		if ((flags & ACPI_NS_PREFIX_MUST_EXIST) && (num_segments > 0)) {
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+
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+			/* Every element of the path must exist (except for the final name_seg) */
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+
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+			local_interpreter_mode = ACPI_IMODE_EXECUTE;
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+		}
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+
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 		/* Extract one ACPI name from the front of the pathname */
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583
 
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 		ACPI_MOVE_32_TO_32(&simple_name, path);
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@@ -544,12 +587,19 @@
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 		status =
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 		    acpi_ns_search_and_enter(simple_name, walk_state,
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-					     current_node, interpreter_mode,
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+					     current_node,
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+					     local_interpreter_mode,
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 					     this_search_type, local_flags,
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 					     &this_node);
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 		if (ACPI_FAILURE(status)) {
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 			if (status == AE_NOT_FOUND) {
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-
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+#if !defined ACPI_ASL_COMPILER	/* Note: iASL reports this error by itself, not needed here */
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+				if (flags & ACPI_NS_PREFIX_MUST_EXIST) {
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+					acpi_os_printf(ACPI_MSG_BIOS_ERROR
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+						       "Object does not exist: %4.4s\n",
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+						       (char *)&simple_name);
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+				}
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+#endif
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 				/* Name not found in ACPI namespace */
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604
 
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 				ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
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@@ -664,7 +714,7 @@
664
714
 
665
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 		/* Point to next name segment and make this node current */
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-		path += ACPI_NAME_SIZE;
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+		path += ACPI_NAMESEG_SIZE;
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 		current_node = this_node;
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 	}
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