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authorLv Zheng <lv.zheng@intel.com>2016-03-10 05:54:29 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-10 23:31:14 +0300
commit5508df89756f8378024828e185724a9bd2348985 (patch)
tree963ef8e30311e1161922f8c259078b97a489e74f /drivers/acpi/acpica/tbxfload.c
parent1e059e20ac297346512d9581a8cd3f3cca6a29f9 (diff)
downloadlinux-5508df89756f8378024828e185724a9bd2348985.tar.xz
ACPICA / Interpreter: Fix a regression triggered because of wrong Linux ECDT support
It is reported that the following commit triggers regressions: Linux commit: efaed9be998b5ae0afb7458e057e5f4402b43fa0 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: efaed9be998b (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>
Diffstat (limited to 'drivers/acpi/acpica/tbxfload.c')
-rw-r--r--drivers/acpi/acpica/tbxfload.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
index 9496b84476a4..3151968c10d1 100644
--- a/drivers/acpi/acpica/tbxfload.c
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -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);
}