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_COMPANION() check against NULL to the chromeos_tbmc driver. Fixes: a2676ead257f ("platform/chrome: chromeos_tbmc: Convert to a platform driver") Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/1875121.VLH7GnMWUR@rafael.j.wysocki Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>