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The `cros_ec_keyb` driver can be probed before the cros_ec_device has completed the registration. This creates a race condition where `cros_ec_keyb` might access uninitialized data. Fix this by calling `cros_ec_device_registered()` to check the parent's status. If the device is not yet ready, return -EPROBE_DEFER to ensure the probe is retried later. Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Link: https://lore.kernel.org/r/20250828083601.856083-6-tzungbi@kernel.org Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>