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We need to initialize the request_fd field in struct vb2_v4l2_buffer to -1 instead of the default of 0. So we need to add a new op that is called when struct vb2_v4l2_buffer is allocated. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>