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, 3 insertions, 0 deletions

diff --git a/sys/dev/acpica/acpi_powerres.c b/sys/dev/acpica/acpi_powerres.c
index a274549..c6415fd 100644
--- a/sys/dev/acpica/acpi_powerres.c
+++ b/sys/dev/acpica/acpi_powerres.c
@@ -166,6 +166,7 @@ acpi_pwr_register_resource(ACPI_HANDLE res)
     rp->ap_resource = res;
 
     /* get the Power Resource object */
+    bzero(&buf, sizeof(buf));
     if ((status = acpi_EvaluateIntoBuffer(res, NULL, NULL, &buf)) != AE_OK) {
 	ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
 	goto out;
@@ -373,6 +374,7 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
 	if (AcpiGetHandle(consumer, "_PR0", &pr0_handle) != AE_OK) {
 	    goto bad;
 	}
+	bzero(&reslist_buffer, sizeof(reslist_buffer));
 	status = acpi_EvaluateIntoBuffer(pr0_handle, NULL, NULL, &reslist_buffer);
 	if (status != AE_OK) {
 	    goto bad;
@@ -389,6 +391,7 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
      * Check that we can actually fetch the list of power resources
      */
     if (reslist_handle != NULL) {
+	bzero(&reslist_buffer, sizeof(reslist_buffer));
 	if ((status = acpi_EvaluateIntoBuffer(reslist_handle, NULL, NULL, &reslist_buffer)) != AE_OK) {
 	    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't evaluate resource list %s\n",
 			      acpi_name(reslist_handle)));