The unregister_chrdev_region() does twice here. The chrdev region was unregistered inside tty_unregister_driver(). Signed-off-by: Phong Tran <tranmanphong@gmail.com> Reviewed-by: Alex Elder <elder@linaro.org> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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