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Rather than testing whether an ioctl is implemented in the driver or not every time the ioctl is called, do it upfront when the device is registered. This also allows a driver to disable certain ioctls based on the capabilities of the detected board, something you can't do today without creating separate v4l2_ioctl_ops structs for each new variation. For the most part it is pretty straightforward, but for control ioctls a flag is needed since it is possible that you have per-filehandle controls, and that can't be determined upfront of course. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>