ACPI / osi: Add acpi_osi=!! to allow reverting acpi_osi=!

This patch introduces acpi_osi=!! so that quirks may use it to revert
acpi_osi=!.

Tested-by: Lukas Wunner <lukas@wunner.de>
Tested-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 0b3de80..c48f387 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -312,6 +312,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        acpi_osi=!*             # remove all strings
                        acpi_osi=!              # disable all built-in OS vendor
                                                  strings
+                       acpi_osi=!!             # enable all built-in OS vendor
+                                                 strings
                        acpi_osi=               # disable all strings
 
                        'acpi_osi=!' can be used in combination with single or

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 9f59dd1..f801b59 100644 (file)
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1763,6 +1763,9 @@ void __init acpi_osi_setup(char *str)
                                osi->enable = false;
                        }
                        return;
+               } else if (*str == '!') {
+                       osi_config.default_disabling = 0;
+                       return;
                }
                enable = false;
        }