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diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
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+
+/******************************************************************************
+ *
+ * Module Name: exsystem - Interface to OS services
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acinterp.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exsystem")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_wait_semaphore
+ *
+ * PARAMETERS: Semaphore - Semaphore to wait on
+ * Timeout - Max time to wait
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Implements a semaphore wait with a check to see if the
+ * semaphore is available immediately. If it is not, the
+ * interpreter is released before waiting.
+ *
+ ******************************************************************************/
+acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
+
+ status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
+ if (ACPI_SUCCESS(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (status == AE_TIME) {
+
+ /* We must wait, so unlock the interpreter */
+
+ acpi_ex_relinquish_interpreter();
+
+ status = acpi_os_wait_semaphore(semaphore, 1, timeout);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "*** Thread awake after blocking, %s\n",
+ acpi_format_exception(status)));
+
+ /* Reacquire the interpreter */
+
+ acpi_ex_reacquire_interpreter();
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_wait_mutex
+ *
+ * PARAMETERS: Mutex - Mutex to wait on
+ * Timeout - Max time to wait
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Implements a mutex wait with a check to see if the
+ * mutex is available immediately. If it is not, the
+ * interpreter is released before waiting.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
+
+ status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
+ if (ACPI_SUCCESS(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (status == AE_TIME) {
+
+ /* We must wait, so unlock the interpreter */
+
+ acpi_ex_relinquish_interpreter();
+
+ status = acpi_os_acquire_mutex(mutex, timeout);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "*** Thread awake after blocking, %s\n",
+ acpi_format_exception(status)));
+
+ /* Reacquire the interpreter */
+
+ acpi_ex_reacquire_interpreter();
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_do_stall
+ *
+ * PARAMETERS: how_long - The amount of time to stall,
+ * in microseconds
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Suspend running thread for specified amount of time.
+ * Note: ACPI specification requires that Stall() does not
+ * relinquish the processor, and delays longer than 100 usec
+ * should use Sleep() instead. We allow stalls up to 255 usec
+ * for compatibility with other interpreters and existing BIOSs.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_do_stall(u32 how_long)
+{
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_ENTRY();
+
+ if (how_long > 255) { /* 255 microseconds */
+ /*
+ * Longer than 255 usec, this is an error
+ *
+ * (ACPI specifies 100 usec as max, but this gives some slack in
+ * order to support existing BIOSs)
+ */
+ ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)",
+ how_long));
+ status = AE_AML_OPERAND_VALUE;
+ } else {
+ acpi_os_stall(how_long);
+ }
+
+ return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_do_suspend
+ *
+ * PARAMETERS: how_long - The amount of time to suspend,
+ * in milliseconds
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Suspend running thread for specified amount of time.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
+{
+ ACPI_FUNCTION_ENTRY();
+
+ /* Since this thread will sleep, we must release the interpreter */
+
+ acpi_ex_relinquish_interpreter();
+
+ acpi_os_sleep(how_long);
+
+ /* And now we must get the interpreter again */
+
+ acpi_ex_reacquire_interpreter();
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_signal_event
+ *
+ * PARAMETERS: obj_desc - The object descriptor for this op
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Provides an access point to perform synchronization operations
+ * within the AML.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
+{
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_TRACE(ex_system_signal_event);
+
+ if (obj_desc) {
+ status =
+ acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_wait_event
+ *
+ * PARAMETERS: time_desc - The 'time to delay' object descriptor
+ * obj_desc - The object descriptor for this op
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Provides an access point to perform synchronization operations
+ * within the AML. This operation is a request to wait for an
+ * event.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
+ union acpi_operand_object *obj_desc)
+{
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_TRACE(ex_system_wait_event);
+
+ if (obj_desc) {
+ status =
+ acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
+ (u16) time_desc->integer.
+ value);
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_system_reset_event
+ *
+ * PARAMETERS: obj_desc - The object descriptor for this op
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Reset an event to a known state.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
+{
+ acpi_status status = AE_OK;
+ acpi_semaphore temp_semaphore;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * We are going to simply delete the existing semaphore and
+ * create a new one!
+ */
+ status =
+ acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
+ if (ACPI_SUCCESS(status)) {
+ (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
+ obj_desc->event.os_semaphore = temp_semaphore;
+ }
+
+ return (status);
+}
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