[patch 047/100] acer-wmi: Blacklist Acer Aspire One

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Carlos Corbacho <carlos@xxxxxxxxxxxxxxxxxxx>

upstream commit: a74dd5fdabcd34c93e17e9c7024eeb503c92b048

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@xxxxxxxxxxxxxxxxxxx>
Reported-by: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/platform/x86/acer-wmi.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -225,6 +225,25 @@ static struct quirk_entry quirk_fujitsu_
 	.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();
 
 	/*

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