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Date: Thu, 24 Mar 2016 09:41:47 +0800
From: Lv Zheng <lv.zheng@...el.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>
Cc: Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
Bob Moore <robert.moore@...el.com>
Subject: [PATCH 28/30] ACPICA: Events: Fix an issue that _REG association can happen before namespace is initialized
ACPICA commit c508f8592efaa0d8197f26d7fee6382c5ac8e383
Current code flow cannot ensure _REG association can happen after the
namespace is initialized, so we move _REG association to where _REG was
about to run to fix this issue.
This issue is detected when acpi_ev_initialize_region() is invoked during
the table loading. And this is one of the most important the root cause why
ACPICA table loading is split into 2 load passes. Lv Zheng.
Link: https://github.com/acpica/acpica/commit/c508f859
Link: https://bugs.acpica.org/show_bug.cgi?id=1252
Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Signed-off-by: Bob Moore <robert.moore@...el.com>
---
drivers/acpi/acpica/acevents.h | 2 --
drivers/acpi/acpica/evregion.c | 71 ++++++++++++++--------------------------
drivers/acpi/acpica/evrgnini.c | 1 -
3 files changed, 24 insertions(+), 50 deletions(-)
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 010cf81..17f2217 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -198,8 +198,6 @@ void
acpi_ev_detach_region(union acpi_operand_object *region_obj,
u8 acpi_ns_is_locked);
-void acpi_ev_associate_reg_method(union acpi_operand_object *region_obj);
-
void
acpi_ev_execute_reg_methods(struct acpi_namespace_node *node,
acpi_adr_space_type space_id, u32 function);
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index 17d61c6..4c6f795 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -526,82 +526,59 @@ acpi_ev_attach_region(union acpi_operand_object *handler_obj,
/*******************************************************************************
*
- * FUNCTION: acpi_ev_associate_reg_method
+ * FUNCTION: acpi_ev_execute_reg_method
*
* PARAMETERS: region_obj - Region object
+ * function - Passed to _REG: On (1) or Off (0)
*
* RETURN: Status
*
- * DESCRIPTION: Find and associate _REG method to a region
+ * DESCRIPTION: Execute _REG method for a region
*
******************************************************************************/
-void acpi_ev_associate_reg_method(union acpi_operand_object *region_obj)
+acpi_status
+acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
{
+ struct acpi_evaluate_info *info;
+ union acpi_operand_object *args[3];
+ union acpi_operand_object *region_obj2;
const acpi_name *reg_name_ptr =
ACPI_CAST_PTR(acpi_name, METHOD_NAME__REG);
struct acpi_namespace_node *method_node;
struct acpi_namespace_node *node;
- union acpi_operand_object *region_obj2;
acpi_status status;
- ACPI_FUNCTION_TRACE(ev_associate_reg_method);
+ ACPI_FUNCTION_TRACE(ev_execute_reg_method);
+
+ if (!acpi_gbl_namespace_initialized ||
+ region_obj->region.handler == NULL) {
+ return_ACPI_STATUS(AE_OK);
+ }
region_obj2 = acpi_ns_get_secondary_object(region_obj);
if (!region_obj2) {
- return_VOID;
+ return_ACPI_STATUS(AE_NOT_EXIST);
}
+ /*
+ * Find any "_REG" method associated with this region definition.
+ * The method should always be updated as this function may be
+ * invoked after a namespace change.
+ */
node = region_obj->region.node->parent;
-
- /* Find any "_REG" method associated with this region definition */
-
status =
acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
&method_node);
if (ACPI_SUCCESS(status)) {
/*
- * The _REG method is optional and there can be only one per region
- * definition. This will be executed when the handler is attached
- * or removed
+ * The _REG method is optional and there can be only one per
+ * region definition. This will be executed when the handler is
+ * attached or removed.
*/
region_obj2->extra.method_REG = method_node;
}
-
- return_VOID;
-}
-
-/*******************************************************************************
- *
- * FUNCTION: acpi_ev_execute_reg_method
- *
- * PARAMETERS: region_obj - Region object
- * function - Passed to _REG: On (1) or Off (0)
- *
- * RETURN: Status
- *
- * DESCRIPTION: Execute _REG method for a region
- *
- ******************************************************************************/
-
-acpi_status
-acpi_ev_execute_reg_method(union acpi_operand_object *region_obj, u32 function)
-{
- struct acpi_evaluate_info *info;
- union acpi_operand_object *args[3];
- union acpi_operand_object *region_obj2;
- acpi_status status;
-
- ACPI_FUNCTION_TRACE(ev_execute_reg_method);
-
- region_obj2 = acpi_ns_get_secondary_object(region_obj);
- if (!region_obj2) {
- return_ACPI_STATUS(AE_NOT_EXIST);
- }
-
- if (region_obj2->extra.method_REG == NULL ||
- region_obj->region.handler == NULL ||
- !acpi_gbl_namespace_initialized) {
+ if (region_obj2->extra.method_REG == NULL) {
return_ACPI_STATUS(AE_OK);
}
diff --git a/drivers/acpi/acpica/evrgnini.c b/drivers/acpi/acpica/evrgnini.c
index fda869c..6972ab4 100644
--- a/drivers/acpi/acpica/evrgnini.c
+++ b/drivers/acpi/acpica/evrgnini.c
@@ -518,7 +518,6 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
return_ACPI_STATUS(AE_OK);
}
- acpi_ev_associate_reg_method(region_obj);
region_obj->common.flags |= AOPOBJ_OBJECT_INITIALIZED;
node = region_obj->region.node->parent;
--
1.7.10
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