Pull acpica into release branch

18 files changed, 450 insertions, 411 deletions

diff --git a/drivers/acpi/dispatcher/dsinit.c b/drivers/acpi/dispatcher/dsinit.c
index bbdf990..daf51b5 100644
--- a/drivers/acpi/dispatcher/dsinit.c
+++ b/drivers/acpi/dispatcher/dsinit.c
@@ -125,37 +125,7 @@ acpi_ds_init_one_object(acpi_handle obj_handle,
 		if (info->table_desc->pointer->revision == 1) {
 			node->flags |= ANOBJ_DATA_WIDTH_32;
 		}
-#ifdef ACPI_INIT_PARSE_METHODS
-		/*
-		 * Note 11/2005: Removed this code to parse all methods during table
-		 * load because it causes problems if there are any errors during the
-		 * parse. Also, it seems like overkill and we probably don't want to
-		 * abort a table load because of an issue with a single method.
-		 */
-
-		/*
-		 * Print a dot for each method unless we are going to print
-		 * the entire pathname
-		 */
-		if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
-			ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "."));
-		}
 
-		/*
-		 * Always parse methods to detect errors, we will delete
-		 * the parse tree below
-		 */
-		status = acpi_ds_parse_method(obj_handle);
-		if (ACPI_FAILURE(status)) {
-			ACPI_ERROR((AE_INFO,
-				    "Method %p [%4.4s] - parse failure, %s",
-				    obj_handle,
-				    acpi_ut_get_node_name(obj_handle),
-				    acpi_format_exception(status)));
-
-			/* This parse failed, but we will continue parsing more methods */
-		}
-#endif
 		info->method_count++;
 		break;
 
diff --git a/drivers/acpi/dispatcher/dsmethod.c b/drivers/acpi/dispatcher/dsmethod.c
index bc9aca4..a39a33f 100644
--- a/drivers/acpi/dispatcher/dsmethod.c
+++ b/drivers/acpi/dispatcher/dsmethod.c
@@ -52,6 +52,10 @@
 #define _COMPONENT          ACPI_DISPATCHER
 ACPI_MODULE_NAME("dsmethod")
 
+/* Local prototypes */
+static acpi_status
+acpi_ds_create_method_mutex(union acpi_operand_object *method_desc);
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ds_method_error
@@ -67,6 +71,7 @@ ACPI_MODULE_NAME("dsmethod")
  *              Note: Allows the exception handler to change the status code
  *
  ******************************************************************************/
+
 acpi_status
 acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
 {
@@ -113,11 +118,51 @@ acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ds_create_method_mutex
+ *
+ * PARAMETERS:  obj_desc            - The method object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create a mutex object for a serialized control method
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ds_create_method_mutex(union acpi_operand_object *method_desc)
+{
+	union acpi_operand_object *mutex_desc;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(ds_create_method_mutex);
+
+	/* Create the new mutex object */
+
+	mutex_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
+	if (!mutex_desc) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	/* Create the actual OS Mutex */
+
+	status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	mutex_desc->mutex.sync_level = method_desc->method.sync_level;
+	method_desc->method.mutex = mutex_desc;
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ds_begin_method_execution
  *
  * PARAMETERS:  method_node         - Node of the method
  *              obj_desc            - The method object
- *              calling_method_node - Caller of this method (if non-null)
+ *              walk_state          - current state, NULL if not yet executing
+ *                                    a method.
  *
  * RETURN:      Status
  *
@@ -128,9 +173,9 @@ acpi_ds_method_error(acpi_status status, struct acpi_walk_state *walk_state)
  ******************************************************************************/
 
 acpi_status
-acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
-			       union acpi_operand_object * obj_desc,
-			       struct acpi_namespace_node * calling_method_node)
+acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node,
+			       union acpi_operand_object *obj_desc,
+			       struct acpi_walk_state *walk_state)
 {
 	acpi_status status = AE_OK;
 
@@ -149,35 +194,80 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 	}
 
 	/*
-	 * If there is a concurrency limit on this method, we need to
-	 * obtain a unit from the method semaphore.
+	 * If this method is serialized, we need to acquire the method mutex.
 	 */
-	if (obj_desc->method.semaphore) {
+	if (obj_desc->method.method_flags & AML_METHOD_SERIALIZED) {
 		/*
-		 * Allow recursive method calls, up to the reentrancy/concurrency
-		 * limit imposed by the SERIALIZED rule and the sync_level method
-		 * parameter.
-		 *
-		 * The point of this code is to avoid permanently blocking a
-		 * thread that is making recursive method calls.
+		 * Create a mutex for the method if it is defined to be Serialized
+		 * and a mutex has not already been created. We defer the mutex creation
+		 * until a method is actually executed, to minimize the object count
 		 */
-		if (method_node == calling_method_node) {
-			if (obj_desc->method.thread_count >=
-			    obj_desc->method.concurrency) {
-				return_ACPI_STATUS(AE_AML_METHOD_LIMIT);
+		if (!obj_desc->method.mutex) {
+			status = acpi_ds_create_method_mutex(obj_desc);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
 			}
 		}
 
 		/*
-		 * Get a unit from the method semaphore. This releases the
-		 * interpreter if we block (then reacquires it)
+		 * The current_sync_level (per-thread) must be less than or equal to
+		 * the sync level of the method. This mechanism provides some
+		 * deadlock prevention
+		 *
+		 * Top-level method invocation has no walk state at this point
 		 */
-		status =
-		    acpi_ex_system_wait_semaphore(obj_desc->method.semaphore,
-						  ACPI_WAIT_FOREVER);
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
+		if (walk_state &&
+		    (walk_state->thread->current_sync_level >
+		     obj_desc->method.mutex->mutex.sync_level)) {
+			ACPI_ERROR((AE_INFO,
+				    "Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%d)",
+				    acpi_ut_get_node_name(method_node),
+				    walk_state->thread->current_sync_level));
+
+			return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
 		}
+
+		/*
+		 * Obtain the method mutex if necessary. Do not acquire mutex for a
+		 * recursive call.
+		 */
+		if (!walk_state ||
+		    !obj_desc->method.mutex->mutex.owner_thread ||
+		    (walk_state->thread !=
+		     obj_desc->method.mutex->mutex.owner_thread)) {
+			/*
+			 * Acquire the method mutex. This releases the interpreter if we
+			 * block (and reacquires it before it returns)
+			 */
+			status =
+			    acpi_ex_system_wait_mutex(obj_desc->method.mutex->
+						      mutex.os_mutex,
+						      ACPI_WAIT_FOREVER);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+
+			/* Update the mutex and walk info and save the original sync_level */
+
+			if (walk_state) {
+				obj_desc->method.mutex->mutex.
+				    original_sync_level =
+				    walk_state->thread->current_sync_level;
+
+				obj_desc->method.mutex->mutex.owner_thread =
+				    walk_state->thread;
+				walk_state->thread->current_sync_level =
+				    obj_desc->method.sync_level;
+			} else {
+				obj_desc->method.mutex->mutex.
+				    original_sync_level =
+				    obj_desc->method.mutex->mutex.sync_level;
+			}
+		}
+
+		/* Always increase acquisition depth */
+
+		obj_desc->method.mutex->mutex.acquisition_depth++;
 	}
 
 	/*
@@ -200,10 +290,10 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node * method_node,
 	return_ACPI_STATUS(status);
 
       cleanup:
-	/* On error, must signal the method semaphore if present */
+	/* On error, must release the method mutex (if present) */
 
-	if (obj_desc->method.semaphore) {
-		(void)acpi_os_signal_semaphore(obj_desc->method.semaphore, 1);
+	if (obj_desc->method.mutex) {
+		acpi_os_release_mutex(obj_desc->method.mutex->mutex.os_mutex);
 	}
 	return_ACPI_STATUS(status);
 }
@@ -253,10 +343,10 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 		return_ACPI_STATUS(AE_NULL_OBJECT);
 	}
 
-	/* Init for new method, possibly wait on concurrency semaphore */
+	/* Init for new method, possibly wait on method mutex */
 
 	status = acpi_ds_begin_method_execution(method_node, obj_desc,
-						this_walk_state->method_node);
+						this_walk_state);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
@@ -478,6 +568,8 @@ acpi_ds_restart_control_method(struct acpi_walk_state *walk_state,
  *              created, delete all locals and arguments, and delete the parse
  *              tree if requested.
  *
+ * MUTEX:       Interpreter is locked
+ *
  ******************************************************************************/
 
 void
@@ -503,26 +595,21 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 	}
 
 	/*
-	 * Lock the parser while we terminate this method.
-	 * If this is the last thread executing the method,
-	 * we have additional cleanup to perform
+	 * If method is serialized, release the mutex and restore the
+	 * current sync level for this thread
 	 */
-	status = acpi_ut_acquire_mutex(ACPI_MTX_CONTROL_METHOD);
-	if (ACPI_FAILURE(status)) {
-		return_VOID;
-	}
+	if (method_desc->method.mutex) {
 
-	/* Signal completion of the execution of this method if necessary */
+		/* Acquisition Depth handles recursive calls */
 
-	if (method_desc->method.semaphore) {
-		status =
-		    acpi_os_signal_semaphore(method_desc->method.semaphore, 1);
-		if (ACPI_FAILURE(status)) {
-
-			/* Ignore error and continue */
+		method_desc->method.mutex->mutex.acquisition_depth--;
+		if (!method_desc->method.mutex->mutex.acquisition_depth) {
+			walk_state->thread->current_sync_level =
+			    method_desc->method.mutex->mutex.
+			    original_sync_level;
 
-			ACPI_EXCEPTION((AE_INFO, status,
-					"Could not signal method semaphore"));
+			acpi_os_release_mutex(method_desc->method.mutex->mutex.
+					      os_mutex);
 		}
 	}
 
@@ -537,7 +624,7 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 
 		status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 		if (ACPI_FAILURE(status)) {
-			goto exit;
+			return_VOID;
 		}
 
 		/*
@@ -580,18 +667,16 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 		/*
 		 * Support to dynamically change a method from not_serialized to
 		 * Serialized if it appears that the method is incorrectly written and
-		 * does not support multiple thread execution.  The best example of this
-		 * is if such a method creates namespace objects and blocks.  A second
+		 * does not support multiple thread execution. The best example of this
+		 * is if such a method creates namespace objects and blocks. A second
 		 * thread will fail with an AE_ALREADY_EXISTS exception
 		 *
 		 * This code is here because we must wait until the last thread exits
 		 * before creating the synchronization semaphore.
 		 */
-		if ((method_desc->method.concurrency == 1) &&
-		    (!method_desc->method.semaphore)) {
-			status = acpi_os_create_semaphore(1, 1,
-							  &method_desc->method.
-							  semaphore);
+		if ((method_desc->method.method_flags & AML_METHOD_SERIALIZED)
+		    && (!method_desc->method.mutex)) {
+			status = acpi_ds_create_method_mutex(method_desc);
 		}
 
 		/* No more threads, we can free the owner_id */
@@ -599,144 +684,5 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 		acpi_ut_release_owner_id(&method_desc->method.owner_id);
 	}
 
-      exit:
-	(void)acpi_ut_release_mutex(ACPI_MTX_CONTROL_METHOD);
 	return_VOID;
 }
-
-#ifdef ACPI_INIT_PARSE_METHODS
-	/*
-	 * Note 11/2005: Removed this code to parse all methods during table
-	 * load because it causes problems if there are any errors during the
-	 * parse. Also, it seems like overkill and we probably don't want to
-	 * abort a table load because of an issue with a single method.
-	 */
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_ds_parse_method
- *
- * PARAMETERS:  Node        - Method node
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Parse the AML that is associated with the method.
- *
- * MUTEX:       Assumes parser is locked
- *
- ******************************************************************************/
-
-acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node)
-{
-	acpi_status status;
-	union acpi_operand_object *obj_desc;
-	union acpi_parse_object *op;
-	struct acpi_walk_state *walk_state;
-
-	ACPI_FUNCTION_TRACE_PTR(ds_parse_method, node);
-
-	/* Parameter Validation */
-
-	if (!node) {
-		return_ACPI_STATUS(AE_NULL_ENTRY);
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** Parsing [%4.4s] **** NamedObj=%p\n",
-			  acpi_ut_get_node_name(node), node));
-
-	/* Extract the method object from the method Node */
-
-	obj_desc = acpi_ns_get_attached_object(node);
-	if (!obj_desc) {
-		return_ACPI_STATUS(AE_NULL_OBJECT);
-	}
-
-	/* Create a mutex for the method if there is a concurrency limit */
-
-	if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) &&
-	    (!obj_desc->method.semaphore)) {
-		status = acpi_os_create_semaphore(obj_desc->method.concurrency,
-						  obj_desc->method.concurrency,
-						  &obj_desc->method.semaphore);
-		if (ACPI_FAILURE(status)) {
-			return_ACPI_STATUS(status);
-		}
-	}
-
-	/*
-	 * Allocate a new parser op to be the root of the parsed
-	 * method tree
-	 */
-	op = acpi_ps_alloc_op(AML_METHOD_OP);
-	if (!op) {
-		return_ACPI_STATUS(AE_NO_MEMORY);
-	}
-
-	/* Init new op with the method name and pointer back to the Node */
-
-	acpi_ps_set_name(op, node->name.integer);
-	op->common.node = node;
-
-	/*
-	 * Get a new owner_id for objects created by this method. Namespace
-	 * objects (such as Operation Regions) can be created during the
-	 * first pass parse.
-	 */
-	status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id);
-	if (ACPI_FAILURE(status)) {
-		goto cleanup;
-	}
-
-	/* Create and initialize a new walk state */
-
-	walk_state =
-	    acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, NULL,
-				      NULL);
-	if (!walk_state) {
-		status = AE_NO_MEMORY;
-		goto cleanup2;
-	}
-
-	status = acpi_ds_init_aml_walk(walk_state, op, node,
-				       obj_desc->method.aml_start,
-				       obj_desc->method.aml_length, NULL, 1);
-	if (ACPI_FAILURE(status)) {
-		acpi_ds_delete_walk_state(walk_state);
-		goto cleanup2;
-	}
-
-	/*
-	 * Parse the method, first pass
-	 *
-	 * The first pass load is where newly declared named objects are added into
-	 * the namespace.  Actual evaluation of the named objects (what would be
-	 * called a "second pass") happens during the actual execution of the
-	 * method so that operands to the named objects can take on dynamic
-	 * run-time values.
-	 */
-	status = acpi_ps_parse_aml(walk_state);
-	if (ACPI_FAILURE(status)) {
-		goto cleanup2;
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
-			  "**** [%4.4s] Parsed **** NamedObj=%p Op=%p\n",
-			  acpi_ut_get_node_name(node), node, op));
-
-	/*
-	 * Delete the parse tree. We simply re-parse the method for every
-	 * execution since there isn't much overhead (compared to keeping lots
-	 * of parse trees around)
-	 */
-	acpi_ns_delete_namespace_subtree(node);
-	acpi_ns_delete_namespace_by_owner(obj_desc->method.owner_id);
-
-      cleanup2:
-	acpi_ut_release_owner_id(&obj_desc->method.owner_id);
-
-      cleanup:
-	acpi_ps_delete_parse_tree(op);
-	return_ACPI_STATUS(status);
-}
-#endif
diff --git a/drivers/acpi/dispatcher/dswexec.c b/drivers/acpi/dispatcher/dswexec.c
index 3acbd91..b1ded62 100644
--- a/drivers/acpi/dispatcher/dswexec.c
+++ b/drivers/acpi/dispatcher/dswexec.c
@@ -472,7 +472,6 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 			    acpi_ds_result_push(walk_state->result_obj,
 						walk_state);
 		}
-
 		break;
 
 	default:
@@ -510,6 +509,7 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 						  "Method Reference in a Package, Op=%p\n",
 						  op));
+
 				op->common.node =
 				    (struct acpi_namespace_node *)op->asl.value.
 				    arg->asl.node->object;
@@ -670,7 +670,6 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 
 				status = acpi_ds_result_stack_pop(walk_state);
 			}
-
 			break;
 
 		case AML_TYPE_UNDEFINED:
@@ -708,7 +707,6 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
 	 * Check if we just completed the evaluation of a
 	 * conditional predicate
 	 */
-
 	if ((ACPI_SUCCESS(status)) &&
 	    (walk_state->control_state) &&
 	    (walk_state->control_state->common.state ==
diff --git a/drivers/acpi/dispatcher/dswload.c b/drivers/acpi/dispatcher/dswload.c
index 3507439..e3ca7f6 100644
--- a/drivers/acpi/dispatcher/dswload.c
+++ b/drivers/acpi/dispatcher/dswload.c
@@ -175,7 +175,7 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 		if (status == AE_NOT_FOUND) {
 			/*
 			 * Table disassembly:
-			 * Target of Scope() not found.  Generate an External for it, and
+			 * Target of Scope() not found. Generate an External for it, and
 			 * insert the name into the namespace.
 			 */
 			acpi_dm_add_to_external_list(path, ACPI_TYPE_DEVICE, 0);
@@ -210,16 +210,15 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 		case ACPI_TYPE_BUFFER:
 
 			/*
-			 * These types we will allow, but we will change the type.  This
+			 * These types we will allow, but we will change the type. This
 			 * enables some existing code of the form:
 			 *
 			 *  Name (DEB, 0)
 			 *  Scope (DEB) { ... }
 			 *
-			 * Note: silently change the type here.  On the second pass, we will report
+			 * Note: silently change the type here. On the second pass, we will report
 			 * a warning
 			 */
-
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
 					  path,
@@ -242,7 +241,6 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 		break;
 
 	default:
-
 		/*
 		 * For all other named opcodes, we will enter the name into
 		 * the namespace.
@@ -259,7 +257,6 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 		 *       buffer_field, or Package), the name of the object is already
 		 *       in the namespace.
 		 */
-
 		if (walk_state->deferred_node) {
 
 			/* This name is already in the namespace, get the node */
@@ -293,8 +290,8 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 		}
 
 		/*
-		 * Enter the named type into the internal namespace.  We enter the name
-		 * as we go downward in the parse tree.  Any necessary subobjects that
+		 * Enter the named type into the internal namespace. We enter the name
+		 * as we go downward in the parse tree. Any necessary subobjects that
 		 * involve arguments to the opcode must be created as we go back up the
 		 * parse tree later.
 		 */
@@ -327,12 +324,12 @@ acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
 							    (status);
 						}
 					}
+
 					status = AE_OK;
 				}
 			}
 
 			if (ACPI_FAILURE(status)) {
-
 				ACPI_ERROR_NAMESPACE(path, status);
 				return_ACPI_STATUS(status);
 			}
@@ -434,9 +431,13 @@ acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 			status =
 			    acpi_ex_create_region(op->named.data,
 						  op->named.length,
-						  (acpi_adr_space_type)
-						  ((op->common.value.arg)->
-						   common.value.integer),
+						  (acpi_adr_space_type) ((op->
+									  common.
+									  value.
+									  arg)->
+									 common.
+									 value.
+									 integer),
 						  walk_state);
 			if (ACPI_FAILURE(status)) {
 				return_ACPI_STATUS(status);
@@ -474,7 +475,7 @@ acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 			 * method_op pkg_length name_string method_flags term_list
 			 *
 			 * Note: We must create the method node/object pair as soon as we
-			 * see the method declaration.  This allows later pass1 parsing
+			 * see the method declaration. This allows later pass1 parsing
 			 * of invocations of the method (need to know the number of
 			 * arguments.)
 			 */
@@ -499,6 +500,7 @@ acpi_status acpi_ds_load1_end_op(struct acpi_walk_state *walk_state)
 								  length,
 								  walk_state);
 				}
+
 				walk_state->operands[0] = NULL;
 				walk_state->num_operands = 0;
 
@@ -570,7 +572,6 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
 			if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
 			    (walk_state->op_info->class == AML_CLASS_CONTROL)) {
-
 				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 						  "Begin/EXEC: %s (fl %8.8X)\n",
 						  walk_state->op_info->name,
@@ -602,7 +603,7 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 		} else {
 			/* Get name from the op */
 
-			buffer_ptr = (char *)&op->named.name;
+			buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
 		}
 	} else {
 		/* Get the namestring from the raw AML */
@@ -629,7 +630,6 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 		break;
 
 	case AML_INT_NAMEPATH_OP:
-
 		/*
 		 * The name_path is an object reference to an existing object.
 		 * Don't enter the name into the namespace, but look it up
@@ -642,7 +642,6 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 		break;
 
 	case AML_SCOPE_OP:
-
 		/*
 		 * The Path is an object reference to an existing object.
 		 * Don't enter the name into the namespace, but look it up
@@ -664,6 +663,7 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 #endif
 			return_ACPI_STATUS(status);
 		}
+
 		/*
 		 * We must check to make sure that the target is
 		 * one of the opcodes that actually opens a scope
@@ -683,13 +683,12 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 		case ACPI_TYPE_BUFFER:
 
 			/*
-			 * These types we will allow, but we will change the type.  This
+			 * These types we will allow, but we will change the type. This
 			 * enables some existing code of the form:
 			 *
 			 *  Name (DEB, 0)
 			 *  Scope (DEB) { ... }
 			 */
-
 			ACPI_WARNING((AE_INFO,
 				      "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)",
 				      buffer_ptr,
@@ -729,14 +728,14 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 				if (ACPI_FAILURE(status)) {
 					return_ACPI_STATUS(status);
 				}
-
 			}
+
 			return_ACPI_STATUS(AE_OK);
 		}
 
 		/*
-		 * Enter the named type into the internal namespace.  We enter the name
-		 * as we go downward in the parse tree.  Any necessary subobjects that
+		 * Enter the named type into the internal namespace. We enter the name
+		 * as we go downward in the parse tree. Any necessary subobjects that
 		 * involve arguments to the opcode must be created as we go back up the
 		 * parse tree later.
 		 *
@@ -787,7 +786,6 @@ acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
 	 * can get it again quickly when this scope is closed
 	 */
 	op->common.node = node;
-
 	return_ACPI_STATUS(status);
 }
 
@@ -922,7 +920,6 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 #ifndef ACPI_NO_METHOD_EXECUTION
 
 	case AML_TYPE_CREATE_FIELD:
-
 		/*
 		 * Create the field object, but the field buffer and index must
 		 * be evaluated later during the execution phase
@@ -931,7 +928,6 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 		break;
 
 	case AML_TYPE_NAMED_FIELD:
-
 		/*
 		 * If we are executing a method, initialize the field
 		 */
@@ -1051,6 +1047,7 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 			 * argument is the space_id. (We must save the address of the
 			 * AML of the address and length operands)
 			 */
+
 			/*
 			 * If we have a valid region, initialize it
 			 * Namespace is NOT locked at this point.
@@ -1080,7 +1077,7 @@ acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 			 * method_op pkg_length name_string method_flags term_list
 			 *
 			 * Note: We must create the method node/object pair as soon as we
-			 * see the method declaration.  This allows later pass1 parsing
+			 * see the method declaration. This allows later pass1 parsing
 			 * of invocations of the method (need to know the number of
 			 * arguments.)
 			 */
diff --git a/drivers/acpi/events/evgpe.c b/drivers/acpi/events/evgpe.c
index f01d339..c76c058 100644
--- a/drivers/acpi/events/evgpe.c
+++ b/drivers/acpi/events/evgpe.c
@@ -382,7 +382,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 	u32 status_reg;
 	u32 enable_reg;
 	acpi_cpu_flags flags;
-	acpi_cpu_flags hw_flags;
 	acpi_native_uint i;
 	acpi_native_uint j;
 
@@ -394,8 +393,11 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 		return (int_status);
 	}
 
-	/* We need to hold the GPE lock now, hardware lock in the loop */
-
+	/*
+	 * We need to obtain the GPE lock for both the data structs and registers
+	 * Note: Not necessary to obtain the hardware lock, since the GPE registers
+	 * are owned by the gpe_lock.
+	 */
 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 
 	/* Examine all GPE blocks attached to this interrupt level */
@@ -413,8 +415,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 
 			gpe_register_info = &gpe_block->register_info[i];
 
-			hw_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-
 			/* Read the Status Register */
 
 			status =
@@ -423,8 +423,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 						   &gpe_register_info->
 						   status_address);
 			if (ACPI_FAILURE(status)) {
-				acpi_os_release_lock(acpi_gbl_hardware_lock,
-						     hw_flags);
 				goto unlock_and_exit;
 			}
 
@@ -435,8 +433,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 						   &enable_reg,
 						   &gpe_register_info->
 						   enable_address);
-			acpi_os_release_lock(acpi_gbl_hardware_lock, hw_flags);
-
 			if (ACPI_FAILURE(status)) {
 				goto unlock_and_exit;
 			}
diff --git a/drivers/acpi/executer/exconfig.c b/drivers/acpi/executer/exconfig.c
index 8233524..83fed07 100644
--- a/drivers/acpi/executer/exconfig.c
+++ b/drivers/acpi/executer/exconfig.c
@@ -266,6 +266,10 @@ acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 		}
 	}
 
+	ACPI_INFO((AE_INFO,
+		   "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
+		   table->signature, table->oem_id, table->oem_table_id));
+
 	*return_desc = ddb_handle;
 	return_ACPI_STATUS(status);
 }
@@ -446,6 +450,10 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
 		return_ACPI_STATUS(status);
 	}
 
+	ACPI_INFO((AE_INFO,
+		   "Dynamic SSDT Load - OemId [%6.6s] OemTableId [%8.8s]",
+		   table_ptr->oem_id, table_ptr->oem_table_id));
+
       cleanup:
 	if (ACPI_FAILURE(status)) {
 		ACPI_FREE(table_ptr);
diff --git a/drivers/acpi/executer/excreate.c b/drivers/acpi/executer/excreate.c
index 106dc72..34eec82 100644
--- a/drivers/acpi/executer/excreate.c
+++ b/drivers/acpi/executer/excreate.c
@@ -177,7 +177,7 @@ acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
 	 * that the event is created in an unsignalled state
 	 */
 	status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
-					  &obj_desc->event.semaphore);
+					  &obj_desc->event.os_semaphore);
 	if (ACPI_FAILURE(status)) {
 		goto cleanup;
 	}
@@ -226,12 +226,9 @@ acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
 		goto cleanup;
 	}
 
-	/*
-	 * Create the actual OS semaphore.
-	 * One unit max to make it a mutex, with one initial unit to allow
-	 * the mutex to be acquired.
-	 */
-	status = acpi_os_create_semaphore(1, 1, &obj_desc->mutex.semaphore);
+	/* Create the actual OS Mutex */
+
+	status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 	if (ACPI_FAILURE(status)) {
 		goto cleanup;
 	}
@@ -565,7 +562,7 @@ acpi_ex_create_method(u8 * aml_start,
 	obj_desc->method.aml_length = aml_length;
 
 	/*
-	 * Disassemble the method flags.  Split off the Arg Count
+	 * Disassemble the method flags. Split off the Arg Count
 	 * for efficiency
 	 */
 	method_flags = (u8) operand[1]->integer.value;
@@ -576,21 +573,19 @@ acpi_ex_create_method(u8 * aml_start,
 	    (u8) (method_flags & AML_METHOD_ARG_COUNT);
 
 	/*
-	 * Get the concurrency count.  If required, a semaphore will be
+	 * Get the sync_level. If method is serialized, a mutex will be
 	 * created for this method when it is parsed.
 	 */
 	if (acpi_gbl_all_methods_serialized) {
-		obj_desc->method.concurrency = 1;
+		obj_desc->method.sync_level = 0;
 		obj_desc->method.method_flags |= AML_METHOD_SERIALIZED;
 	} else if (method_flags & AML_METHOD_SERIALIZED) {
 		/*
-		 * ACPI 1.0: Concurrency = 1
-		 * ACPI 2.0: Concurrency = (sync_level (in method declaration) + 1)
+		 * ACPI 1.0: sync_level = 0
+		 * ACPI 2.0: sync_level = sync_level in method declaration
 		 */
-		obj_desc->method.concurrency = (u8)
-		    (((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4) + 1);
-	} else {
-		obj_desc->method.concurrency = ACPI_INFINITE_CONCURRENCY;
+		obj_desc->method.sync_level = (u8)
+		    ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
 	}
 
 	/* Attach the new object to the method Node */
diff --git a/drivers/acpi/executer/exdump.c b/drivers/acpi/executer/exdump.c
index 7b9718e..2450943 100644
--- a/drivers/acpi/executer/exdump.c
+++ b/drivers/acpi/executer/exdump.c
@@ -118,14 +118,14 @@ static struct acpi_exdump_info acpi_ex_dump_device[4] = {
 
 static struct acpi_exdump_info acpi_ex_dump_event[2] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_event), NULL},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(event.semaphore), "Semaphore"}
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(event.os_semaphore), "OsSemaphore"}
 };
 
 static struct acpi_exdump_info acpi_ex_dump_method[8] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_method), NULL},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.param_count), "ParamCount"},
-	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.concurrency), "Concurrency"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(method.semaphore), "Semaphore"},
+	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.sync_level), "Sync Level"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(method.mutex), "Mutex"},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.owner_id), "Owner Id"},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(method.thread_count), "Thread Count"},
 	{ACPI_EXD_UINT32, ACPI_EXD_OFFSET(method.aml_length), "Aml Length"},
@@ -138,7 +138,7 @@ static struct acpi_exdump_info acpi_ex_dump_mutex[5] = {
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.owner_thread), "Owner Thread"},
 	{ACPI_EXD_UINT16, ACPI_EXD_OFFSET(mutex.acquisition_depth),
 	 "Acquire Depth"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.semaphore), "Semaphore"}
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(mutex.os_mutex), "OsMutex"}
 };
 
 static struct acpi_exdump_info acpi_ex_dump_region[7] = {
diff --git a/drivers/acpi/executer/exfldio.c b/drivers/acpi/executer/exfldio.c
index 051053f..40f0bee 100644
--- a/drivers/acpi/executer/exfldio.c
+++ b/drivers/acpi/executer/exfldio.c
@@ -727,11 +727,23 @@ acpi_ex_extract_from_field(union acpi_operand_object *obj_desc,
 			return_ACPI_STATUS(status);
 		}
 
-		/* Merge with previous datum if necessary */
-
-		merged_datum |= raw_datum <<
-		    (obj_desc->common_field.access_bit_width -
-		     obj_desc->common_field.start_field_bit_offset);
+		/*
+		 * Merge with previous datum if necessary.
+		 *
+		 * Note: Before the shift, check if the shift value will be larger than
+		 * the integer size. If so, there is no need to perform the operation.
+		 * This avoids the differences in behavior between different compilers
+		 * concerning shift values larger than the target data width.
+		 */
+		if ((obj_desc->common_field.access_bit_width -
+		     obj_desc->common_field.start_field_bit_offset) <
+		    ACPI_INTEGER_BIT_SIZE) {
+			merged_datum |=
+			    raw_datum << (obj_desc->common_field.
+					  access_bit_width -
+					  obj_desc->common_field.
+					  start_field_bit_offset);
+		}
 
 		if (i == datum_count) {
 			break;
@@ -808,13 +820,23 @@ acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
 		return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
 	}
 
-	/* Compute the number of datums (access width data items) */
+	/*
+	 * Create the bitmasks used for bit insertion.
+	 * Note: This if/else is used to bypass compiler differences with the
+	 * shift operator
+	 */
+	if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
+		width_mask = ACPI_INTEGER_MAX;
+	} else {
+		width_mask =
+		    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
+					 access_bit_width);
+	}
 
-	width_mask =
-	    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.access_bit_width);
-	mask =
-	    width_mask & ACPI_MASK_BITS_BELOW(obj_desc->common_field.
-					      start_field_bit_offset);
+	mask = width_mask &
+	    ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
+
+	/* Compute the number of datums (access width data items) */
 
 	datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
 				       obj_desc->common_field.access_bit_width);
@@ -848,12 +870,29 @@ acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
 			return_ACPI_STATUS(status);
 		}
 
-		/* Start new output datum by merging with previous input datum */
-
 		field_offset += obj_desc->common_field.access_byte_width;
-		merged_datum = raw_datum >>
-		    (obj_desc->common_field.access_bit_width -
-		     obj_desc->common_field.start_field_bit_offset);
+
+		/*
+		 * Start new output datum by merging with previous input datum
+		 * if necessary.
+		 *
+		 * Note: Before the shift, check if the shift value will be larger than
+		 * the integer size. If so, there is no need to perform the operation.
+		 * This avoids the differences in behavior between different compilers
+		 * concerning shift values larger than the target data width.
+		 */
+		if ((obj_desc->common_field.access_bit_width -
+		     obj_desc->common_field.start_field_bit_offset) <
+		    ACPI_INTEGER_BIT_SIZE) {
+			merged_datum =
+			    raw_datum >> (obj_desc->common_field.
+					  access_bit_width -
+					  obj_desc->common_field.
+					  start_field_bit_offset);
+		} else {
+			merged_datum = 0;
+		}
+
 		mask = width_mask;
 
 		if (i == datum_count) {
diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c
index 93098d6..d8ac287 100644
--- a/drivers/acpi/executer/exmutex.c
+++ b/drivers/acpi/executer/exmutex.c
@@ -161,12 +161,13 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
 
 	/*
 	 * Current Sync must be less than or equal to the sync level of the
-	 * mutex.  This mechanism provides some deadlock prevention
+	 * mutex. This mechanism provides some deadlock prevention
 	 */
 	if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
 		ACPI_ERROR((AE_INFO,
-			    "Cannot acquire Mutex [%4.4s], incorrect SyncLevel",
-			    acpi_ut_get_node_name(obj_desc->mutex.node)));
+			    "Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)",
+			    acpi_ut_get_node_name(obj_desc->mutex.node),
+			    walk_state->thread->current_sync_level));
 		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
 	}
 
@@ -178,8 +179,7 @@ acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
 
 		if ((obj_desc->mutex.owner_thread->thread_id ==
 		     walk_state->thread->thread_id) ||
-		    (obj_desc->mutex.semaphore ==
-		     acpi_gbl_global_lock_semaphore)) {
+		    (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK)) {
 			/*
 			 * The mutex is already owned by this thread,
 			 * just increment the acquisition depth
@@ -264,7 +264,7 @@ acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
 	 */
 	if ((obj_desc->mutex.owner_thread->thread_id !=
 	     walk_state->thread->thread_id)
-	    && (obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) {
+	    && (obj_desc->mutex.os_mutex != ACPI_GLOBAL_LOCK)) {
 		ACPI_ERROR((AE_INFO,
 			    "Thread %X cannot release Mutex [%4.4s] acquired by thread %X",
 			    walk_state->thread->thread_id,
diff --git a/drivers/acpi/executer/exsystem.c b/drivers/acpi/executer/exsystem.c
index 52beee3..6b5d1e6 100644
--- a/drivers/acpi/executer/exsystem.c
+++ b/drivers/acpi/executer/exsystem.c
@@ -63,14 +63,14 @@ ACPI_MODULE_NAME("exsystem")
  *              interpreter is released.
  *
  ******************************************************************************/
-acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout)
+acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
 {
 	acpi_status status;
 	acpi_status status2;
 
 	ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
 
-	status = acpi_os_wait_semaphore(semaphore, 1, 0);
+	status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
 	if (ACPI_SUCCESS(status)) {
 		return_ACPI_STATUS(status);
 	}
@@ -103,6 +103,59 @@ acpi_status acpi_ex_system_wait_semaphore(acpi_handle semaphore, u16 timeout)
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ex_system_wait_mutex
+ *
+ * PARAMETERS:  Mutex           - Mutex 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.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
+{
+	acpi_status status;
+	acpi_status status2;
+
+	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_exit_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 */
+
+		status2 = acpi_ex_enter_interpreter();
+		if (ACPI_FAILURE(status2)) {
+
+			/* Report fatal error, could not acquire interpreter */
+
+			return_ACPI_STATUS(status2);
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ex_system_do_stall
  *
  * PARAMETERS:  how_long        - The amount of time to stall,
@@ -176,7 +229,7 @@ acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
  *
  * FUNCTION:    acpi_ex_system_acquire_mutex
  *
- * PARAMETERS:  time_desc       - The 'time to delay' object descriptor
+ * PARAMETERS:  time_desc       - Maximum time to wait for the mutex
  *              obj_desc        - The object descriptor for this op
  *
  * RETURN:      Status
@@ -201,14 +254,14 @@ acpi_ex_system_acquire_mutex(union acpi_operand_object * time_desc,
 
 	/* Support for the _GL_ Mutex object -- go get the global lock */
 
-	if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
+	if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
 		status =
 		    acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_ex_system_wait_semaphore(obj_desc->mutex.semaphore,
-					       (u16) time_desc->integer.value);
+	status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
+					   (u16) time_desc->integer.value);
 	return_ACPI_STATUS(status);
 }
 
@@ -239,13 +292,13 @@ acpi_status acpi_ex_system_release_mutex(union acpi_operand_object *obj_desc)
 
 	/* Support for the _GL_ Mutex object -- release the global lock */
 
-	if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
+	if (obj_desc->mutex.os_mutex == ACPI_GLOBAL_LOCK) {
 		status = acpi_ev_release_global_lock();
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_os_signal_semaphore(obj_desc->mutex.semaphore, 1);
-	return_ACPI_STATUS(status);
+	acpi_os_release_mutex(obj_desc->mutex.os_mutex);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
@@ -268,7 +321,8 @@ acpi_status acpi_ex_system_signal_event(union acpi_operand_object *obj_desc)
 	ACPI_FUNCTION_TRACE(ex_system_signal_event);
 
 	if (obj_desc) {
-		status = acpi_os_signal_semaphore(obj_desc->event.semaphore, 1);
+		status =
+		    acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
 	}
 
 	return_ACPI_STATUS(status);
@@ -299,7 +353,7 @@ acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
 
 	if (obj_desc) {
 		status =
-		    acpi_ex_system_wait_semaphore(obj_desc->event.semaphore,
+		    acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
 						  (u16) time_desc->integer.
 						  value);
 	}
@@ -322,7 +376,7 @@ acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
 acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
 {
 	acpi_status status = AE_OK;
-	void *temp_semaphore;
+	acpi_semaphore temp_semaphore;
 
 	ACPI_FUNCTION_ENTRY();
 
@@ -333,8 +387,8 @@ acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
 	status =
 	    acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
 	if (ACPI_SUCCESS(status)) {
-		(void)acpi_os_delete_semaphore(obj_desc->event.semaphore);
-		obj_desc->event.semaphore = temp_semaphore;
+		(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
+		obj_desc->event.os_semaphore = temp_semaphore;
 	}
 
 	return (status);
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c
index ae142de..3143f36 100644
--- a/drivers/acpi/hardware/hwregs.c
+++ b/drivers/acpi/hardware/hwregs.c
@@ -172,9 +172,9 @@ acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b)
 	}
 
 	/*
-	 * The package must have at least two elements.  NOTE (March 2005): This
+	 * The package must have at least two elements. NOTE (March 2005): This
 	 * goes against the current ACPI spec which defines this object as a
-	 * package with one encoded DWORD element.  However, existing practice
+	 * package with one encoded DWORD element. However, existing practice
 	 * by BIOS vendors seems to be to have 2 or more elements, at least
 	 * one per sleep type (A/B).
 	 */
@@ -255,7 +255,7 @@ struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
  *              return_value    - Value that was read from the register
  *              Flags           - Lock the hardware or not
  *
- * RETURN:      Status and the value read from specified Register.  Value
+ * RETURN:      Status and the value read from specified Register. Value
  *              returned is normalized to bit0 (is shifted all the way right)
  *
  * DESCRIPTION: ACPI bit_register read function.
@@ -361,8 +361,8 @@ acpi_status acpi_set_register(u32 register_id, u32 value, u32 flags)
 	case ACPI_REGISTER_PM1_STATUS:
 
 		/*
-		 * Status Registers are different from the rest.  Clear by
-		 * writing 1, and writing 0 has no effect.  So, the only relevant
+		 * Status Registers are different from the rest. Clear by
+		 * writing 1, and writing 0 has no effect. So, the only relevant
 		 * information is the single bit we're interested in, all others should
 		 * be written as 0 so they will be left unchanged.
 		 */
@@ -467,14 +467,13 @@ ACPI_EXPORT_SYMBOL(acpi_set_register)
  *
  * FUNCTION:    acpi_hw_register_read
  *
- * PARAMETERS:  use_lock            - Mutex hw access
- *              register_id         - register_iD + Offset
+ * PARAMETERS:  use_lock            - Lock hardware? True/False
+ *              register_id         - ACPI Register ID
  *              return_value        - Where the register value is returned
  *
  * RETURN:      Status and the value read.
  *
- * DESCRIPTION: Acpi register read function.  Registers are read at the
- *              given offset.
+ * DESCRIPTION: Read from the specified ACPI register
  *
  ******************************************************************************/
 acpi_status
@@ -580,14 +579,26 @@ acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value)
  *
  * FUNCTION:    acpi_hw_register_write
  *
- * PARAMETERS:  use_lock            - Mutex hw access
- *              register_id         - register_iD + Offset
+ * PARAMETERS:  use_lock            - Lock hardware? True/False
+ *              register_id         - ACPI Register ID
  *              Value               - The value to write
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Acpi register Write function.  Registers are written at the
- *              given offset.
+ * DESCRIPTION: Write to the specified ACPI register
+ *
+ * NOTE: In accordance with the ACPI specification, this function automatically
+ * preserves the value of the following bits, meaning that these bits cannot be
+ * changed via this interface:
+ *
+ * PM1_CONTROL[0] = SCI_EN
+ * PM1_CONTROL[9]
+ * PM1_STATUS[11]
+ *
+ * ACPI References:
+ * 1) Hardware Ignored Bits: When software writes to a register with ignored
+ *      bit fields, it preserves the ignored bit fields
+ * 2) SCI_EN: OSPM always preserves this bit position
  *
  ******************************************************************************/
 
@@ -595,6 +606,7 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 {
 	acpi_status status;
 	acpi_cpu_flags lock_flags = 0;
+	u32 read_value;
 
 	ACPI_FUNCTION_TRACE(hw_register_write);
 
@@ -605,6 +617,22 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 	switch (register_id) {
 	case ACPI_REGISTER_PM1_STATUS:	/* 16-bit access */
 
+		/* Perform a read first to preserve certain bits (per ACPI spec) */
+
+		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
+					       ACPI_REGISTER_PM1_STATUS,
+					       &read_value);
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+
+		/* Insert the bits to be preserved */
+
+		ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
+				 read_value);
+
+		/* Now we can write the data */
+
 		status =
 		    acpi_hw_low_level_write(16, value,
 					    &acpi_gbl_FADT->xpm1a_evt_blk);
@@ -635,6 +663,25 @@ acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
 
 	case ACPI_REGISTER_PM1_CONTROL:	/* 16-bit access */
 
+		/*
+		 * Perform a read first to preserve certain bits (per ACPI spec)
+		 *
+		 * Note: This includes SCI_EN, we never want to change this bit
+		 */
+		status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
+					       ACPI_REGISTER_PM1_CONTROL,
+					       &read_value);
+		if (ACPI_FAILURE(status)) {
+			goto unlock_and_exit;
+		}
+
+		/* Insert the bits to be preserved */
+
+		ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
+				 read_value);
+
+		/* Now we can write the data */
+
 		status =
 		    acpi_hw_low_level_write(16, value,
 					    &acpi_gbl_FADT->xpm1a_cnt_blk);
@@ -726,7 +773,7 @@ acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg)
 		return (AE_OK);
 	}
 
-	/* Get a local copy of the address.  Handles possible alignment issues */
+	/* Get a local copy of the address. Handles possible alignment issues */
 
 	ACPI_MOVE_64_TO_64(&address, &reg->address);
 	if (!address) {
@@ -798,7 +845,7 @@ acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg)
 		return (AE_OK);
 	}
 
-	/* Get a local copy of the address.  Handles possible alignment issues */
+	/* Get a local copy of the address. Handles possible alignment issues */
 
 	ACPI_MOVE_64_TO_64(&address, &reg->address);
 	if (!address) {
diff --git a/drivers/acpi/namespace/nsaccess.c b/drivers/acpi/namespace/nsaccess.c
index 48fadad..c1c6c23 100644
--- a/drivers/acpi/namespace/nsaccess.c
+++ b/drivers/acpi/namespace/nsaccess.c
@@ -196,33 +196,30 @@ acpi_status acpi_ns_root_initialize(void)
 				    (u8) (ACPI_TO_INTEGER(val) - 1);
 
 				if (ACPI_STRCMP(init_val->name, "_GL_") == 0) {
-					/*
-					 * Create a counting semaphore for the
-					 * global lock
-					 */
+
+					/* Create a counting semaphore for the global lock */
+
 					status =
 					    acpi_os_create_semaphore
 					    (ACPI_NO_UNIT_LIMIT, 1,
-					     &obj_desc->mutex.semaphore);
+					     &acpi_gbl_global_lock_semaphore);
 					if (ACPI_FAILURE(status)) {
 						acpi_ut_remove_reference
 						    (obj_desc);
 						goto unlock_and_exit;
 					}
 
-					/*
-					 * We just created the mutex for the
-					 * global lock, save it
-					 */
-					acpi_gbl_global_lock_semaphore =
-					    obj_desc->mutex.semaphore;
+					/* Mark this mutex as very special */
+
+					obj_desc->mutex.os_mutex =
+					    ACPI_GLOBAL_LOCK;
 				} else {
 					/* Create a mutex */
 
-					status = acpi_os_create_semaphore(1, 1,
-									  &obj_desc->
-									  mutex.
-									  semaphore);
+					status =
+					    acpi_os_create_mutex(&obj_desc->
+								 mutex.
+								 os_mutex);
 					if (ACPI_FAILURE(status)) {
 						acpi_ut_remove_reference
 						    (obj_desc);
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 8e46d1b..afd937b 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -688,18 +688,9 @@ EXPORT_SYMBOL(acpi_os_wait_events_complete);
 /*
  * Allocate the memory for a spinlock and initialize it.
  */
-acpi_status acpi_os_create_lock(acpi_handle * out_handle)
+acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 {
-	spinlock_t *lock_ptr;
-
-
-	lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
-
-	spin_lock_init(lock_ptr);
-
-	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
-
-	*out_handle = lock_ptr;
+	spin_lock_init(*handle);
 
 	return AE_OK;
 }
@@ -707,13 +698,8 @@ acpi_status acpi_os_create_lock(acpi_handle * out_handle)
 /*
  * Deallocate the memory for a spinlock.
  */
-void acpi_os_delete_lock(acpi_handle handle)
+void acpi_os_delete_lock(acpi_spinlock handle)
 {
-
-	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
-
-	acpi_os_free(handle);
-
 	return;
 }
 
@@ -1037,10 +1023,10 @@ EXPORT_SYMBOL(max_cstate);
  * handle is a pointer to the spinlock_t.
  */
 
-acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
+acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
 {
 	acpi_cpu_flags flags;
-	spin_lock_irqsave((spinlock_t *) handle, flags);
+	spin_lock_irqsave(lockp, flags);
 	return flags;
 }
 
@@ -1048,9 +1034,9 @@ acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle)
  * Release a spinlock. See above.
  */
 
-void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags)
+void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
 {
-	spin_unlock_irqrestore((spinlock_t *) handle, flags);
+	spin_unlock_irqrestore(lockp, flags);
 }
 
 #ifndef ACPI_USE_LOCAL_CACHE
diff --git a/drivers/acpi/parser/psparse.c b/drivers/acpi/parser/psparse.c
index 7ee2f2e..a02aa62 100644
--- a/drivers/acpi/parser/psparse.c
+++ b/drivers/acpi/parser/psparse.c
@@ -469,6 +469,16 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 	}
 
 	walk_state->thread = thread;
+
+	/*
+	 * If executing a method, the starting sync_level is this method's
+	 * sync_level
+	 */
+	if (walk_state->method_desc) {
+		walk_state->thread->current_sync_level =
+		    walk_state->method_desc->method.sync_level;
+	}
+
 	acpi_ds_push_walk_state(walk_state, thread);
 
 	/*
@@ -505,6 +515,10 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 			status =
 			    acpi_ds_call_control_method(thread, walk_state,
 							NULL);
+			if (ACPI_FAILURE(status)) {
+				status =
+				    acpi_ds_method_error(status, walk_state);
+			}
 
 			/*
 			 * If the transfer to the new method method call worked, a new walk
@@ -525,7 +539,7 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 			/* Check for possible multi-thread reentrancy problem */
 
 			if ((status == AE_ALREADY_EXISTS) &&
-			    (!walk_state->method_desc->method.semaphore)) {
+			    (!walk_state->method_desc->method.mutex)) {
 				/*
 				 * Method tried to create an object twice. The probable cause is
 				 * that the method cannot handle reentrancy.
@@ -537,7 +551,7 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
 				 */
 				walk_state->method_desc->method.method_flags |=
 				    AML_METHOD_SERIALIZED;
-				walk_state->method_desc->method.concurrency = 1;
+				walk_state->method_desc->method.sync_level = 0;
 			}
 		}
 
diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c
index 67b9f32..38ebe1c 100644
--- a/drivers/acpi/utilities/utdelete.c
+++ b/drivers/acpi/utilities/utdelete.c
@@ -155,21 +155,30 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 	case ACPI_TYPE_MUTEX:
 
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
-				  "***** Mutex %p, Semaphore %p\n",
-				  object, object->mutex.semaphore));
+				  "***** Mutex %p, OS Mutex %p\n",
+				  object, object->mutex.os_mutex));
 
-		acpi_ex_unlink_mutex(object);
-		(void)acpi_os_delete_semaphore(object->mutex.semaphore);
+		if (object->mutex.os_mutex != ACPI_GLOBAL_LOCK) {
+			acpi_ex_unlink_mutex(object);
+			acpi_os_delete_mutex(object->mutex.os_mutex);
+		} else {
+			/* Global Lock "mutex" is actually a counting semaphore */
+
+			(void)
+			    acpi_os_delete_semaphore
+			    (acpi_gbl_global_lock_semaphore);
+			acpi_gbl_global_lock_semaphore = NULL;
+		}
 		break;
 
 	case ACPI_TYPE_EVENT:
 
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
-				  "***** Event %p, Semaphore %p\n",
-				  object, object->event.semaphore));
+				  "***** Event %p, OS Semaphore %p\n",
+				  object, object->event.os_semaphore));
 
-		(void)acpi_os_delete_semaphore(object->event.semaphore);
-		object->event.semaphore = NULL;
+		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
+		object->event.os_semaphore = NULL;
 		break;
 
 	case ACPI_TYPE_METHOD:
@@ -177,12 +186,13 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Method %p\n", object));
 
-		/* Delete the method semaphore if it exists */
+		/* Delete the method mutex if it exists */
 
-		if (object->method.semaphore) {
-			(void)acpi_os_delete_semaphore(object->method.
-						       semaphore);
-			object->method.semaphore = NULL;
+		if (object->method.mutex) {
+			acpi_os_delete_mutex(object->method.mutex->mutex.
+					     os_mutex);
+			acpi_ut_delete_object_desc(object->method.mutex);
+			object->method.mutex = NULL;
 		}
 		break;
 
diff --git a/drivers/acpi/utilities/utglobal.c b/drivers/acpi/utilities/utglobal.c
index e5999c6..014030a 100644
--- a/drivers/acpi/utilities/utglobal.c
+++ b/drivers/acpi/utilities/utglobal.c
@@ -794,6 +794,7 @@ void acpi_ut_init_globals(void)
 
 	/* Global Lock support */
 
+	acpi_gbl_global_lock_semaphore = NULL;
 	acpi_gbl_global_lock_acquired = FALSE;
 	acpi_gbl_global_lock_thread_count = 0;
 	acpi_gbl_global_lock_handle = 0;
diff --git a/drivers/acpi/utilities/utmutex.c b/drivers/acpi/utilities/utmutex.c
index 25eb343..dfc8f30 100644
--- a/drivers/acpi/utilities/utmutex.c
+++ b/drivers/acpi/utilities/utmutex.c
@@ -82,12 +82,9 @@ acpi_status acpi_ut_mutex_initialize(void)
 
 	/* Create the spinlocks for use at interrupt level */
 
-	status = acpi_os_create_lock(&acpi_gbl_gpe_lock);
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
+	spin_lock_init(acpi_gbl_gpe_lock);
+	spin_lock_init(acpi_gbl_hardware_lock);
 
-	status = acpi_os_create_lock(&acpi_gbl_hardware_lock);
 	return_ACPI_STATUS(status);
 }
 
@@ -146,9 +143,8 @@ static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
 	}
 
 	if (!acpi_gbl_mutex_info[mutex_id].mutex) {
-		status = acpi_os_create_semaphore(1, 1,
-						  &acpi_gbl_mutex_info
-						  [mutex_id].mutex);
+		status =
+		    acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
 		acpi_gbl_mutex_info[mutex_id].thread_id =
 		    ACPI_MUTEX_NOT_ACQUIRED;
 		acpi_gbl_mutex_info[mutex_id].use_count = 0;
@@ -171,7 +167,6 @@ static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
 
 static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
 {
-	acpi_status status;
 
 	ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
 
@@ -179,12 +174,12 @@ static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	status = acpi_os_delete_semaphore(acpi_gbl_mutex_info[mutex_id].mutex);
+	acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
 
 	acpi_gbl_mutex_info[mutex_id].mutex = NULL;
 	acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 
-	return_ACPI_STATUS(status);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
@@ -251,8 +246,8 @@ acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
 			  "Thread %X attempting to acquire Mutex [%s]\n",
 			  this_thread_id, acpi_ut_get_mutex_name(mutex_id)));
 
-	status = acpi_os_wait_semaphore(acpi_gbl_mutex_info[mutex_id].mutex,
-					1, ACPI_WAIT_FOREVER);
+	status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
+				       ACPI_WAIT_FOREVER);
 	if (ACPI_SUCCESS(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 				  "Thread %X acquired Mutex [%s]\n",
@@ -284,7 +279,6 @@ acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
 
 acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
 {
-	acpi_status status;
 	acpi_thread_id this_thread_id;
 
 	ACPI_FUNCTION_NAME(ut_release_mutex);
@@ -340,19 +334,6 @@ acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
 
 	acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 
-	status =
-	    acpi_os_signal_semaphore(acpi_gbl_mutex_info[mutex_id].mutex, 1);
-
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status,
-				"Thread %X could not release Mutex [%X]",
-				this_thread_id, mutex_id));
-	} else {
-		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
-				  "Thread %X released Mutex [%s]\n",
-				  this_thread_id,
-				  acpi_ut_get_mutex_name(mutex_id)));
-	}
-
-	return (status);
+	acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
+	return (AE_OK);
 }