ACPICA: revert "acpi_serialize" changes

This reverts 977a6226feae3e2c10a4d8227625ff0f04b49239
and reverts 1ba753acb372c2955a4843302e92e49ce82e2fea
and updates acpi_ev_queue_notify_request()
to restore the previous implementation of the
"acpi_serialize" workaround.

http://bugzilla.kernel.org/show_bug.cgi?id=8171

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/namespace/nsinit.c b/drivers/acpi/namespace/nsinit.c
index 33db224..c4ab615 100644
--- a/drivers/acpi/namespace/nsinit.c
+++ b/drivers/acpi/namespace/nsinit.c
@@ -214,7 +214,7 @@
 			u32 level, void *context, void **return_value)
 {
 	acpi_object_type type;
-	acpi_status status = AE_OK;
+	acpi_status status;
 	struct acpi_init_walk_info *info =
 	    (struct acpi_init_walk_info *)context;
 	struct acpi_namespace_node *node =
@@ -268,7 +268,10 @@
 	/*
 	 * Must lock the interpreter before executing AML code
 	 */
-	acpi_ex_enter_interpreter();
+	status = acpi_ex_enter_interpreter();
+	if (ACPI_FAILURE(status)) {
+		return (status);
+	}
 
 	/*
 	 * Each of these types can contain executable AML code within the