[Bug 699382] New: v4l2: dmabuf handling is broken

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=699382
  GStreamer | gst-plugins-good | git

           Summary: v4l2: dmabuf handling is broken
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
                CC: slomo at circular-chaos.org, benjamin.gaignard at gmail.com,
                    m.olbrich at pengutronix.de
        Depends on: 699337
     GNOME version: ---


+++ This bug was initially created as a clone of Bug #699337 +++

The whole DMABUF code is currently broken.
V4L2_MEMORY_DMABUF is an alternative to V4L2_MEMORY_USERPTR that can be used to
queue other DMABUF file descriptors. To create new DMABUF file descriptors
V4L2_MEMORY_MMAP + VIDIOC_EXPBUF must be used. The two modes cannot be mixed.
Right now QBUF fails because the device is configured for MMAP and a DMABUF
buffer is queued.

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