From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Every platform driver can be forced to match a device that doesn't match
its list of device IDs because of device_match_driver_override(), so
platform drivers that rely on the existence of a device's ACPI companion
object need to verify its presence.

Accordingly, add a requisite ACPI_HANDLE() check against NULL to the
platform/x86 adv_swbutton driver.

Fixes: 3d904005f686 ("platform/x86: add support for Advantech software defined button")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/platform/x86/adv_swbutton.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/platform/x86/adv_swbutton.c
+++ b/drivers/platform/x86/adv_swbutton.c
@@ -48,10 +48,14 @@ static int adv_swbutton_probe(struct pla
 {
 	struct adv_swbutton *button;
 	struct input_dev *input;
-	acpi_handle handle = ACPI_HANDLE(&device->dev);
+	acpi_handle handle;
 	acpi_status status;
 	int error;
 
+	handle = ACPI_HANDLE(&device->dev);
+	if (!handle)
+		return -ENODEV;
+
 	button = devm_kzalloc(&device->dev, sizeof(*button), GFP_KERNEL);
 	if (!button)
 		return -ENOMEM;