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-rw-r--r--drivers/platform/x86/thinkpad_acpi.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 5a22a064222..c8d74dbacbb 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -5696,6 +5696,10 @@ static struct ibm_struct ecdump_driver_data = {
* Bit 3-0: backlight brightness level
*
* brightness_get_raw returns status data in the HBRV layout
+ *
+ * WARNING: The X61 has been verified to use HBRV for something else, so
+ * this should be used _only_ on IBM ThinkPads, and maybe with some careful
+ * testing on the very early *60 Lenovo models...
*/
enum {
@@ -5996,6 +6000,12 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
brightness_mode);
}
+ /* Safety */
+ if (thinkpad_id.vendor != PCI_VENDOR_ID_IBM &&
+ (brightness_mode == TPACPI_BRGHT_MODE_ECNVRAM ||
+ brightness_mode == TPACPI_BRGHT_MODE_EC))
+ return -EINVAL;
+
if (tpacpi_brightness_get_raw(&b) < 0)
return 1;