[Bug 730441] dmabuf: shared the mapping with shared copies of the memory

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730441
  GStreamer | gst-plugins-base | git

--- Comment #10 from Michael Olbrich <m.olbrich at pengutronix.de> 2014-07-11 07:59:05 UTC ---
The patch for gstdmabuf.c looks good and I didn't see any regessions with it.
But I wonder if this could be solved differently:

delegate _get_fd() to the parent if fd == -1 and delegate _map()/_unmap() only
to the parent if fd == -1

That should fix _get_fd() and make parenting V4l2Memory to DmabufMemory
possible.

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