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ACPICA / Interpreter: Fix a regression triggered because of wrong Linux ECDT support

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It is reported that the following commit triggers regressions:
 Linux commit: efaed9be99
 ACPICA commit: 31178590dde82368fdb0f6b0e466b6c0add96c57
 Subject: ACPICA: Events: Enhance acpi_ev_execute_reg_method() to
          ensure no _REG evaluations can happen during OS early boot
          stages

This is because that the ECDT support is not corrected in Linux, and Linux
requires to execute _REG for ECDT (though this sounds so wrong), we need to
ensure acpi_gbl_namespace_initialized is set before ECDT probing in order
for _REG to be executed. Since we have to move
"acpi_gbl_namespace_initialized = TRUE" to the initialization step
happening before ECDT probing, acpi_load_tables() is the best candidate for
now. Thus this patch fixes the regression by doing so.

But if the ECDT support is fixed, Linux will not execute _REG for ECDT, and
ECDT probing will happen before acpi_load_tables(). At that time, we still
want to ensure acpi_gbl_namespace_initialized is set after executing
acpi_ns_initialize_objects() (under the condition of
acpi_gbl_group_module_level_code = FALSE), this patch also moves
acpi_ns_initialize_objects() to acpi_load_tables() accordingly.

Since acpi_ns_initialize_objects() doesn't seem to be skippable, this
patch also removes ACPI_NO_OBJECT_INIT for the one invoked in
acpi_load_tables(). And since the default region handlers should always be
installed before loading the tables, this patch also removes useless
acpi_gbl_group_module_level_code check accordingly. Reported by Chris
Bainbridge, Fixed by Lv Zheng.

Fixes: efaed9be99 (ACPICA: Events: Enhance acpi_ev_execute_reg_method() to ensure no _REG evaluations can happen during OS early boot stages)
Reported-and-tested-by: Chris Bainbridge <chris.bainbridge@gmail.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2016-03-10 10:54:29 +08:00 committed by Rafael J. Wysocki
parent 1e059e20ac
commit 5508df8975
3 changed files with 32 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/acpica/nsinit.c
View File

@ -84,6 +84,8 @@ acpi_status acpi_ns_initialize_objects(void)
ACPI_FUNCTION_TRACE(ns_initialize_objects);
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Completing Initialization of ACPI Objects\n"));
ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
"**** Starting initialization of namespace objects ****\n"));
ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,

26
drivers/acpi/acpica/tbxfload.c
View File

@ -81,13 +81,11 @@ acpi_status __init acpi_load_tables(void)
* between acpi_initialize_subsystem() and acpi_load_tables() to use
* their customized default region handlers.
*/
if (acpi_gbl_group_module_level_code) {
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
ACPI_EXCEPTION((AE_INFO, status,
"During Region initialization"));
return_ACPI_STATUS(status);
}
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
ACPI_EXCEPTION((AE_INFO, status,
"During Region initialization"));
return_ACPI_STATUS(status);
}
/* Load the namespace from the tables */
@ -105,6 +103,20 @@ acpi_status __init acpi_load_tables(void)
"While loading namespace from ACPI tables"));
}
if (!acpi_gbl_group_module_level_code) {
/*
* Initialize the objects that remain uninitialized. This
* runs the executable AML that may be part of the
* declaration of these objects:
* operation_regions, buffer_fields, Buffers, and Packages.
*/
status = acpi_ns_initialize_objects();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
acpi_gbl_namespace_initialized = TRUE;
return_ACPI_STATUS(status);
}

43
drivers/acpi/acpica/utxfinit.c
View File

@ -154,23 +154,6 @@ acpi_status __init acpi_enable_subsystem(u32 flags)
*/
acpi_gbl_early_initialization = FALSE;
/*
* Install the default operation region handlers. These are the
* handlers that are defined by the ACPI specification to be
* "always accessible" -- namely, system_memory, system_IO, and
* PCI_Config. This also means that no _REG methods need to be
* run for these address spaces. We need to have these handlers
* installed before any AML code can be executed, especially any
* module-level code (11/2015).
*/
if (!acpi_gbl_group_module_level_code) {
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"During Region initialization"));
return_ACPI_STATUS(status);
}
}
#if (!ACPI_REDUCED_HARDWARE)
/* Enable ACPI mode */
@ -284,25 +267,21 @@ acpi_status __init acpi_initialize_objects(u32 flags)
*/
if (acpi_gbl_group_module_level_code) {
acpi_ns_exec_module_code_list();
}
/*
* Initialize the objects that remain uninitialized. This runs the
* executable AML that may be part of the declaration of these objects:
* operation_regions, buffer_fields, Buffers, and Packages.
*/
if (!(flags & ACPI_NO_OBJECT_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Completing Initialization of ACPI Objects\n"));
status = acpi_ns_initialize_objects();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
/*
* Initialize the objects that remain uninitialized. This
* runs the executable AML that may be part of the
* declaration of these objects:
* operation_regions, buffer_fields, Buffers, and Packages.
*/
if (!(flags & ACPI_NO_OBJECT_INIT)) {
status = acpi_ns_initialize_objects();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
}
acpi_gbl_namespace_initialized = TRUE;
/*
* Initialize all device/region objects in the namespace. This runs
* the device _STA and _INI methods and region _REG methods.