Add OS layer ACPI mutex and threading support.

 - Temporary fix a bug of Intel ACPI CA core code.
 - Add OS layer ACPI mutex support.  This can be disabled by
   specifying option ACPI_NO_SEMAPHORES.
 - Add ACPI threading support.  Now that we have a dedicate taskqueue for
   ACPI tasks and more ACPI task threads can be created by specifying option
   ACPI_MAX_THREADS.
 - Change acpi_EvaluateIntoBuffer() behavior slightly to reuse given
   caller's buffer unless AE_BUFFER_OVERFLOW occurs.  Also CM battery's
   evaluations were changed to use acpi_EvaluateIntoBuffer().
 - Add new utility function acpi_ConvertBufferToInteger().
 - Add simple locking for CM battery and temperature updating.
 - Fix a minor problem on EC locking.
 - Make the thermal zone polling rate to be changeable.
 - Change minor things on AcpiOsSignal(); in ACPI_SIGNAL_FATAL case,
   entering Debugger is easier to investigate the problem rather than panic.

1 files changed, 5 insertions, 5 deletions

diff --git a/sys/contrib/dev/acpica/exsystem.c b/sys/contrib/dev/acpica/exsystem.c
index df03448..b462597 100644
--- a/sys/contrib/dev/acpica/exsystem.c
+++ b/sys/contrib/dev/acpica/exsystem.c
@@ -147,7 +147,7 @@ AcpiExSystemWaitSemaphore (
     ACPI_HANDLE             Semaphore,
     UINT32                  Timeout)
 {
-    ACPI_STATUS             Status;
+    ACPI_STATUS             Status, Status2;
 
 
     FUNCTION_TRACE ("ExSystemWaitSemaphore");
@@ -172,12 +172,12 @@ AcpiExSystemWaitSemaphore (
 
         /* Reacquire the interpreter */
 
-        Status = AcpiExEnterInterpreter ();
-        if (ACPI_SUCCESS (Status))
+        Status2 = AcpiExEnterInterpreter ();
+        if (ACPI_FAILURE (Status2))
         {
-            /* Restore the timeout exception */
+            /* Report fatal error, could not acquire interpreter */
 
-            Status = AE_TIME;
+            return_ACPI_STATUS (Status2);
         }
     }