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| author | Bob Moore <robert.moore@intel.com> | 2014-03-24 10:49:00 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-03-26 19:25:59 +0400 |
| commit | 22b5afce6a0f29f995b0cce83a5033892dd306d8 (patch) | |
| tree | 5733ad0071177f398108a8932b7d7108bd74c4ca /drivers/acpi/osl.c | |
| parent | e2b8ddcc6b3fbb860e15c5d52455735e128326aa (diff) | |
| download | linux-22b5afce6a0f29f995b0cce83a5033892dd306d8.tar.xz | |
ACPICA: Add auto-serialization support for ill-behaved control methods.
This change adds support to automatically mark a control method as
"serialized" if the method creates any named objects. This will
positively prevent the method from being entered by more than one
thread and thus preventing a possible abort when an attempt is
made to create an object twice.
Implemented by parsing all non-serialize control methods at table
load time.
This feature is disabled by default and this patch also adds a new
Linux kernel parameter "acpi_auto_serialize" to allow this feature
to be turned on for a specific boot.
References: https://bugzilla.kernel.org/show_bug.cgi?id=52191
Signed-off-by: Bob Moore <robert.moore@intel.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/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index b7af3b758f32..74a160cf85b9 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -1539,6 +1539,22 @@ static int __init osi_setup(char *str) __setup("acpi_osi=", osi_setup); +/* + * Enable the auto-serialization of named objects creation methods. + * + * This feature is disabled by default. It marks the AML control methods + * that contain the opcodes to create named objects as "Serialized". + */ +static int __init acpi_auto_serialize_setup(char *str) +{ + acpi_gbl_auto_serialize_methods = TRUE; + pr_info("ACPI: auto-serialization enabled\n"); + + return 1; +} + +__setup("acpi_auto_serialize", acpi_auto_serialize_setup); + /* Check of resource interference between native drivers and ACPI * OperationRegions (SystemIO and System Memory only). * IO ports and memory declared in ACPI might be used by the ACPI subsystem |