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Subject[PATCH 3/6] ACPICA: Dispatcher: Tune interpreter lock around acpi_ev_initialize_region()
Date
In code path of acpi_ev_initialize_region(), there are namespace modification
code unlocked. This patch tunes the code to make sure such modification are
locked. Lv Zheng.

Reported-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
---
drivers/acpi/acpica/dsinit.c | 11 +++--------
drivers/acpi/acpica/dsmethod.c | 12 +++---------
drivers/acpi/acpica/dswload2.c | 2 --
drivers/acpi/acpica/evrgnini.c | 3 +++
drivers/acpi/acpica/nsload.c | 2 ++
5 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/drivers/acpi/acpica/dsinit.c b/drivers/acpi/acpica/dsinit.c
index f1e6dcc..54d48b9 100644
--- a/drivers/acpi/acpica/dsinit.c
+++ b/drivers/acpi/acpica/dsinit.c
@@ -46,6 +46,7 @@
#include "acdispat.h"
#include "acnamesp.h"
#include "actables.h"
+#include "acinterp.h"

#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dsinit")
@@ -214,23 +215,17 @@ acpi_ds_initialize_objects(u32 table_index,

/* Walk entire namespace from the supplied root */

- status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
- }
-
/*
* We don't use acpi_walk_namespace since we do not want to acquire
* the namespace reader lock.
*/
status =
acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
- ACPI_NS_WALK_UNLOCK, acpi_ds_init_one_object,
- NULL, &info, NULL);
+ 0, acpi_ds_init_one_object, NULL, &info,
+ NULL);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
}
- (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

status = acpi_get_table_by_index(table_index, &table);
if (ACPI_FAILURE(status)) {
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c
index 5997e59..2b3210f 100644
--- a/drivers/acpi/acpica/dsmethod.c
+++ b/drivers/acpi/acpica/dsmethod.c
@@ -99,14 +99,11 @@ acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
"Method auto-serialization parse [%4.4s] %p\n",
acpi_ut_get_node_name(node), node));

- acpi_ex_enter_interpreter();
-
/* Create/Init a root op for the method parse tree */

op = acpi_ps_alloc_op(AML_METHOD_OP, obj_desc->method.aml_start);
if (!op) {
- status = AE_NO_MEMORY;
- goto unlock;
+ return_ACPI_STATUS(AE_NO_MEMORY);
}

acpi_ps_set_name(op, node->name.integer);
@@ -118,8 +115,7 @@ acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
acpi_ds_create_walk_state(node->owner_id, NULL, NULL, NULL);
if (!walk_state) {
acpi_ps_free_op(op);
- status = AE_NO_MEMORY;
- goto unlock;
+ return_ACPI_STATUS(AE_NO_MEMORY);
}

status = acpi_ds_init_aml_walk(walk_state, op, node,
@@ -128,7 +124,7 @@ acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
if (ACPI_FAILURE(status)) {
acpi_ds_delete_walk_state(walk_state);
acpi_ps_free_op(op);
- goto unlock;
+ return_ACPI_STATUS(status);
}

walk_state->descending_callback = acpi_ds_detect_named_opcodes;
@@ -138,8 +134,6 @@ acpi_ds_auto_serialize_method(struct acpi_namespace_node *node,
status = acpi_ps_parse_aml(walk_state);

acpi_ps_delete_parse_tree(op);
-unlock:
- acpi_ex_exit_interpreter();
return_ACPI_STATUS(status);
}

diff --git a/drivers/acpi/acpica/dswload2.c b/drivers/acpi/acpica/dswload2.c
index 028b22a..e362182 100644
--- a/drivers/acpi/acpica/dswload2.c
+++ b/drivers/acpi/acpica/dswload2.c
@@ -607,11 +607,9 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
}
}

- acpi_ex_exit_interpreter();
status =
acpi_ev_initialize_region
(acpi_ns_get_attached_object(node), FALSE);
- acpi_ex_enter_interpreter();

if (ACPI_FAILURE(status)) {
/*
diff --git a/drivers/acpi/acpica/evrgnini.c b/drivers/acpi/acpica/evrgnini.c
index 3843f1f..75ddd16 100644
--- a/drivers/acpi/acpica/evrgnini.c
+++ b/drivers/acpi/acpica/evrgnini.c
@@ -45,6 +45,7 @@
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
+#include "acinterp.h"

#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evrgnini")
@@ -597,9 +598,11 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
}
}

+ acpi_ex_exit_interpreter();
status =
acpi_ev_execute_reg_method(region_obj,
ACPI_REG_CONNECT);
+ acpi_ex_enter_interpreter();

if (acpi_ns_locked) {
status =
diff --git a/drivers/acpi/acpica/nsload.c b/drivers/acpi/acpica/nsload.c
index 334d3c5..d1f2014 100644
--- a/drivers/acpi/acpica/nsload.c
+++ b/drivers/acpi/acpica/nsload.c
@@ -137,7 +137,9 @@ unlock:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"**** Begin Table Object Initialization\n"));

+ acpi_ex_enter_interpreter();
status = acpi_ds_initialize_objects(table_index, node);
+ acpi_ex_exit_interpreter();

ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"**** Completed Table Object Initialization\n"));
--
2.7.4
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