ACPICA: Re-implement interpreters' "serialized mode"

Enhanced the implementation of the interpreters'
serialized mode (boot with "acpi_serialize" to set
acpi_glb_all_methods_serialized flag.)
When this mode is specified, instead of creating a serialization
semaphore per control method, the interpreter lock is
simply no longer released before a blocking operation
during control method execution. This effectively makes
the AML Interpreter single-threaded. The overhead of a
semaphore per-method is eliminated.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/acpi/namespace/nsinit.c b/drivers/acpi/namespace/nsinit.c
index aec8488c0019..0d3a42bf2f15 100644
--- a/drivers/acpi/namespace/nsinit.c
+++ b/drivers/acpi/namespace/nsinit.c
@@ -213,7 +213,7 @@ acpi_ns_init_one_object(acpi_handle obj_handle,
                         u32 level, void *context, void **return_value)
 {
         acpi_object_type type;
-        acpi_status status;
+        acpi_status status = AE_OK;
         struct acpi_init_walk_info *info =
             (struct acpi_init_walk_info *)context;
         struct acpi_namespace_node *node =
@@ -267,10 +267,7 @@ acpi_ns_init_one_object(acpi_handle obj_handle,
         /*
          * Must lock the interpreter before executing AML code
          */
-        status = acpi_ex_enter_interpreter();
-        if (ACPI_FAILURE(status)) {
-                return (status);
-        }
+        acpi_ex_enter_interpreter();
 
         /*
          * Each of these types can contain executable AML code within the