ACPI: disable _OSI(Linux) by default

In Linux-2.6.22 we expanded the boot parameter osi=
so that it can enable and !enable an OSI string.

_OSI(Linux) is a special case because we know that there
are both systems that require it set, and systems
require that it _not_ to be set.  In the long term it can't
be set, for the same reason _OS(Linux) can't be enabled --
it tends to confuse BIOS that are not properly
validated with Linux.  Further, the semantics and version
information of _OSI(Linux) were never actually defined.

The kernel prints out a message if it sees _OSI(Linux)
requested, and there is a DMI workaround to invoke
"osi=Linux" automatically for existing systems that need it.

http://bugzilla.kernel.org/show_bug.cgi?id=7787

Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 58ceb18..3f244eb 100644 (file)
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -77,13 +77,7 @@ static struct workqueue_struct *kacpi_notify_wq;
 #define        OSI_STRING_LENGTH_MAX 64        /* arbitrary */
 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 
-#define OSI_LINUX_ENABLED
-#ifdef OSI_LINUX_ENABLED
-int osi_linux = 1;     /* enable _OSI(Linux) by default */
-#else
 int osi_linux;         /* disable _OSI(Linux) by default */
-#endif
-
 
 #ifdef CONFIG_DMI
 static struct __initdata dmi_system_id acpi_osl_dmi_table[];
@@ -1183,17 +1177,10 @@ acpi_os_validate_interface (char *interface)
        if (!strcmp("Linux", interface)) {
                printk(KERN_WARNING PREFIX
                        "System BIOS is requesting _OSI(Linux)\n");
-#ifdef OSI_LINUX_ENABLED
-               printk(KERN_WARNING PREFIX
-                       "Please test with \"acpi_osi=!Linux\"\n"
-                       "Please send dmidecode "
-                       "to linux-acpi@vger.kernel.org\n");
-#else
                printk(KERN_WARNING PREFIX
                        "If \"acpi_osi=Linux\" works better,\n"
                        "Please send dmidecode "
                        "to linux-acpi@vger.kernel.org\n");
-#endif
                if(osi_linux)
                        return AE_OK;
        }
@@ -1227,36 +1214,14 @@ acpi_os_validate_address (
 }
 
 #ifdef CONFIG_DMI
-#ifdef OSI_LINUX_ENABLED
-static int dmi_osi_not_linux(struct dmi_system_id *d)
-{
-       printk(KERN_NOTICE "%s detected: requires not _OSI(Linux)\n", d->ident);
-       enable_osi_linux(0);
-       return 0;
-}
-#else
 static int dmi_osi_linux(struct dmi_system_id *d)
 {
-       printk(KERN_NOTICE "%s detected: requires _OSI(Linux)\n", d->ident);
+       printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);
        enable_osi_linux(1);
        return 0;
 }
-#endif
 
 static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
-#ifdef OSI_LINUX_ENABLED
-       /*
-        * Boxes that need NOT _OSI(Linux)
-        */
-       {
-        .callback = dmi_osi_not_linux,
-        .ident = "Toshiba Satellite P100",
-        .matches = {
-                    DMI_MATCH(DMI_BOARD_VENDOR, "TOSHIBA"),
-                    DMI_MATCH(DMI_BOARD_NAME, "Satellite P100"),
-                    },
-        },
-#else
        /*
         * Boxes that need _OSI(Linux)
         */
@@ -1268,7 +1233,6 @@ static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {
                     DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
                     },
         },
-#endif
        {}
 };
 #endif /* CONFIG_DMI */