2 files changed, 19 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7116fda7077f..bf0fda0125f0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -231,6 +231,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
         acpi_no_auto_ssdt       [HW,ACPI] Disable automatic loading of SSDT
 
+        acpica_no_return_repair [HW, ACPI]
+                        Disable AML predefined validation mechanism
+                        This mechanism can repair the evaluation result to make
+                        the return objects more ACPI specification compliant.
+                        This option is useful for developers to identify the
+                        root cause of an AML interpreter issue when the issue
+                        has something to do with the repair mechanism.
+
         acpi_os_name=   [HW,ACPI] Tell ACPI BIOS the name of the OS
                         Format: To spoof as Windows 98: ="Microsoft Windows"
 
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index fc1aa7909690..0d7b7145399e 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1780,6 +1780,17 @@ static int __init acpi_no_auto_ssdt_setup(char *s)
 
 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
 
+static int __init acpi_disable_return_repair(char *s)
+{
+        printk(KERN_NOTICE PREFIX
+               "ACPI: Predefined validation mechanism disabled\n");
+        acpi_gbl_disable_auto_repair = TRUE;
+
+        return 1;
+}
+
+__setup("acpica_no_return_repair", acpi_disable_return_repair);
+
 acpi_status __init acpi_os_initialize(void)
 {
         acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);