struct vb2_buffer and struct vb2_v4l2_buffer both have a "struct vb2_plane planes[max]" member ?

[Hans de Goede <hdegoede@xxxxxxxxxx>]

Hi all,

While working on converting the atomisp code to videobuf2 I noticed
that "struct vb2_buffer" has a:
	
	struct vb2_plane        planes[VB2_MAX_PLANES];

member and "struct vb2_v4l2_buffer" extends "struct vb2_plane",
yet it also contains a (duplicate?) "struct vb2_plane" array:

struct vb2_v4l2_buffer {
	struct vb2_buffer       vb2_buf;
	...
	struct vb2_plane        planes[VB2_MAX_PLANES];
};

Since both are the exact same type having 2 of them seems
weird.

Is there any reasons why we cannot replace all uses of
vb2_v4l2_buffer.planes with vb2_v4l2_buffer.vb2_buf.planes
and then drop vb2_v4l2_buffer.planes?

Regards,

Hans