acer-wmi: Blacklist Acer Aspire One

The Aspire One's ACPI-WMI interface is a placeholder that does nothing,
and the invalid results that we get from it are now causing userspace
problems as acer-wmi always returns that the rfkill is enabled (i.e. the
radio is off, when it isn't). As it's hardware controlled, acer-wmi
isn't needed on the Aspire One either.

Thanks to Andy Whitcroft at Canonical for tracking down Ubuntu's userspace
issues to this.

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Reported-by: Andy Whitcroft <apw@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index a6a42e8c060b..60fbef283e73 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -225,6 +225,25 @@ static struct quirk_entry quirk_fujitsu_amilo_li_1718 = {
         .wireless = 2,
 };
 
+/* The Aspire One has a dummy ACPI-WMI interface - disable it */
+static struct dmi_system_id __devinitdata acer_blacklist[] = {
+        {
+                .ident = "Acer Aspire One (SSD)",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
+                },
+        },
+        {
+                .ident = "Acer Aspire One (HDD)",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "AOA150"),
+                },
+        },
+        {}
+};
+
 static struct dmi_system_id acer_quirks[] = {
         {
                 .callback = dmi_matched,
@@ -1254,6 +1273,12 @@ static int __init acer_wmi_init(void)
 
         printk(ACER_INFO "Acer Laptop ACPI-WMI Extras\n");
 
+        if (dmi_check_system(acer_blacklist)) {
+                printk(ACER_INFO "Blacklisted hardware detected - "
+                                "not loading\n");
+                return -ENODEV;
+        }
+
         find_quirks();
 
         /*