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When running a 32-bit inputattach utility in a 64-bit system, there will be error code "inputattach: can't set device type". This is caused by the serport device driver not supporting compat_ioctl, so that SPIOCSTYPE ioctl fails. Cc: stable@vger.kernel.org Signed-off-by: John Sung <penmount.touch@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>