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[media] v4l: Share code between video_usercopy and video_ioctl2
The two functions are mostly identical. They handle the copy_from_user and copy_to_user operations related with V4L2 ioctls and call the real ioctl handler. Create a __video_usercopy function that implements the core of video_usercopy and video_ioctl2, and call that function from both. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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