[PATCH 14/16] ACPICA: Predefined name repair: automatically remove null package elements
From: Bob Moore
Date: Fri Dec 11 2009 - 02:29:44 EST
This change will automatically remove embedded and trailing NULL
package elements from returned package objects that are defined
to containe a variable number of sub-packages. The driver is then
presented with a package with no null elements to deal with.
ACPICA BZ 819.
http://www.acpica.org/bugzilla/show_bug.cgi?id=819
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx>
---
drivers/acpi/acpica/acnamesp.h | 5 ++
drivers/acpi/acpica/nspredef.c | 59 +++++++----------------------
drivers/acpi/acpica/nsrepair2.c | 79 ++++++++++++++++++++++----------------
3 files changed, 65 insertions(+), 78 deletions(-)
diff --git a/drivers/acpi/acpica/acnamesp.h b/drivers/acpi/acpica/acnamesp.h
index 14cef45..61edb15 100644
--- a/drivers/acpi/acpica/acnamesp.h
+++ b/drivers/acpi/acpica/acnamesp.h
@@ -296,6 +296,11 @@ acpi_ns_complex_repairs(struct acpi_predefined_data *data,
acpi_status validate_status,
union acpi_operand_object **return_object_ptr);
+void
+acpi_ns_remove_null_elements(struct acpi_predefined_data *data,
+ u8 package_type,
+ union acpi_operand_object *obj_desc);
+
/*
* nssearch - Namespace searching and entry
*/
diff --git a/drivers/acpi/acpica/nspredef.c b/drivers/acpi/acpica/nspredef.c
index 239fa2f..d34fa59 100644
--- a/drivers/acpi/acpica/nspredef.c
+++ b/drivers/acpi/acpica/nspredef.c
@@ -231,9 +231,6 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
* Note: Package may have been newly created by call above.
*/
if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
-
- /* TBD: For variable-length Packages, remove NULL elements here */
-
status = acpi_ns_check_package(data, return_object_ptr);
if (ACPI_FAILURE(status)) {
goto exit;
@@ -439,6 +436,13 @@ acpi_ns_check_package(struct acpi_predefined_data *data,
data->pathname, package->ret_info.type,
return_object->package.count));
+ /*
+ * For variable-length Packages, we can safely remove all embedded
+ * and trailing NULL package elements
+ */
+ acpi_ns_remove_null_elements(data, package->ret_info.type,
+ return_object);
+
/* Extract package count and elements array */
elements = return_object->package.elements;
@@ -692,53 +696,18 @@ acpi_ns_check_package_list(struct acpi_predefined_data *data,
union acpi_operand_object *sub_package;
union acpi_operand_object **sub_elements;
acpi_status status;
- u8 non_trailing_null = FALSE;
u32 expected_count;
u32 i;
u32 j;
- /* Validate each sub-Package in the parent Package */
-
+ /*
+ * Validate each sub-Package in the parent Package
+ *
+ * NOTE: assumes list of sub-packages contains no NULL elements.
+ * Any NULL elements should have been removed by earlier call
+ * to acpi_ns_remove_null_elements.
+ */
for (i = 0; i < count; i++) {
- /*
- * Handling for NULL package elements. For now, we will simply allow
- * a parent package with trailing NULL elements. This can happen if
- * the package was defined to be longer than the initializer list.
- * This is legal as per the ACPI specification. It is often used
- * to allow for dynamic initialization of a Package.
- *
- * A future enhancement may be to simply truncate the package to
- * remove the trailing NULL elements.
- */
- if (!(*elements)) {
- if (!non_trailing_null) {
-
- /* Ensure the remaining elements are all NULL */
-
- for (j = 1; j < (count - i + 1); j++) {
- if (elements[j]) {
- non_trailing_null = TRUE;
- }
- }
-
- if (!non_trailing_null) {
-
- /* Ignore the trailing NULL elements */
-
- return (AE_OK);
- }
- }
-
- /* There are trailing non-null elements, issue warning */
-
- ACPI_WARN_PREDEFINED((AE_INFO, data->pathname,
- data->node_flags,
- "Found NULL element at package index %u",
- i));
- elements++;
- continue;
- }
-
sub_package = *elements;
sub_elements = sub_package->package.elements;
diff --git a/drivers/acpi/acpica/nsrepair2.c b/drivers/acpi/acpica/nsrepair2.c
index e7373eb..f13691c 100644
--- a/drivers/acpi/acpica/nsrepair2.c
+++ b/drivers/acpi/acpica/nsrepair2.c
@@ -45,6 +45,7 @@
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
+#include "acpredef.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsrepair2")
@@ -93,9 +94,6 @@ acpi_ns_check_sorted_list(struct acpi_predefined_data *data,
u8 sort_direction, char *sort_key_name);
static acpi_status
-acpi_ns_remove_null_elements(union acpi_operand_object *package);
-
-static acpi_status
acpi_ns_sort_list(union acpi_operand_object **elements,
u32 count, u32 index, u8 sort_direction);
@@ -456,25 +454,10 @@ acpi_ns_check_sorted_list(struct acpi_predefined_data *data,
}
/*
- * Detect any NULL package elements and remove them from the
- * package.
- *
- * TBD: We may want to do this for all predefined names that
- * return a variable-length package of packages.
+ * NOTE: assumes list of sub-packages contains no NULL elements.
+ * Any NULL elements should have been removed by earlier call
+ * to acpi_ns_remove_null_elements.
*/
- status = acpi_ns_remove_null_elements(return_object);
- if (status == AE_NULL_ENTRY) {
- ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
- "%s: NULL elements removed from package\n",
- data->pathname));
-
- /* Exit if package is now zero length */
-
- if (!return_object->package.count) {
- return (AE_NULL_ENTRY);
- }
- }
-
outer_elements = return_object->package.elements;
outer_element_count = return_object->package.count;
if (!outer_element_count) {
@@ -544,36 +527,63 @@ acpi_ns_check_sorted_list(struct acpi_predefined_data *data,
*
* FUNCTION: acpi_ns_remove_null_elements
*
- * PARAMETERS: obj_desc - A Package object
+ * PARAMETERS: Data - Pointer to validation data structure
+ * package_type - An acpi_return_package_types value
+ * obj_desc - A Package object
*
- * RETURN: Status. AE_NULL_ENTRY means that one or more elements were
- * removed.
+ * RETURN: None.
*
- * DESCRIPTION: Remove all NULL package elements and update the package count.
+ * DESCRIPTION: Remove all NULL package elements from packages that contain
+ * a variable number of sub-packages.
*
*****************************************************************************/
-static acpi_status
-acpi_ns_remove_null_elements(union acpi_operand_object *obj_desc)
+void
+acpi_ns_remove_null_elements(struct acpi_predefined_data *data,
+ u8 package_type,
+ union acpi_operand_object *obj_desc)
{
union acpi_operand_object **source;
union acpi_operand_object **dest;
- acpi_status status = AE_OK;
u32 count;
u32 new_count;
u32 i;
+ ACPI_FUNCTION_NAME(ns_remove_null_elements);
+
+ /*
+ * PTYPE1 packages contain no subpackages.
+ * PTYPE2 packages contain a variable number of sub-packages. We can
+ * safely remove all NULL elements from the PTYPE2 packages.
+ */
+ switch (package_type) {
+ case ACPI_PTYPE1_FIXED:
+ case ACPI_PTYPE1_VAR:
+ case ACPI_PTYPE1_OPTION:
+ return;
+
+ case ACPI_PTYPE2:
+ case ACPI_PTYPE2_COUNT:
+ case ACPI_PTYPE2_PKG_COUNT:
+ case ACPI_PTYPE2_FIXED:
+ case ACPI_PTYPE2_MIN:
+ case ACPI_PTYPE2_REV_FIXED:
+ break;
+
+ default:
+ return;
+ }
+
count = obj_desc->package.count;
new_count = count;
source = obj_desc->package.elements;
dest = source;
- /* Examine all elements of the package object */
+ /* Examine all elements of the package object, remove nulls */
for (i = 0; i < count; i++) {
if (!*source) {
- status = AE_NULL_ENTRY;
new_count--;
} else {
*dest = *source;
@@ -582,15 +592,18 @@ acpi_ns_remove_null_elements(union acpi_operand_object *obj_desc)
source++;
}
- if (status == AE_NULL_ENTRY) {
+ /* Update parent package if any null elements were removed */
+
+ if (new_count < count) {
+ ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
+ "%s: Found and removed %u NULL elements\n",
+ data->pathname, (count - new_count)));
/* NULL terminate list and update the package count */
*dest = NULL;
obj_desc->package.count = new_count;
}
-
- return (status);
}
/******************************************************************************