ideapad: make sure we bind on the correct device

By reading from method _CFG to make sure we bind on the correct VPC2004 device.

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/platform/x86/ideapad_acpi.c b/drivers/platform/x86/ideapad_acpi.c
index e07d6072e75c..bf684f421290 100644
--- a/drivers/platform/x86/ideapad_acpi.c
+++ b/drivers/platform/x86/ideapad_acpi.c
@@ -326,10 +326,13 @@ MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 
 static int ideapad_acpi_add(struct acpi_device *adevice)
 {
-        int i;
+        int i, cfg;
         int devs_present[5];
         struct ideapad_private *priv;
 
+        if (read_method_int(adevice->handle, "_CFG", &cfg))
+                return -ENODEV;
+
         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
                 devs_present[i] = ideapad_dev_exists(i);
                 if (devs_present[i] < 0)