[Bug 786176] New: kmssink: DMAbuf cache is not thread safe

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786176

            Bug ID: 786176
           Summary: kmssink: DMAbuf cache is not thread safe
    Classification: Platform
           Product: GStreamer
           Version: 1.13.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Using qdata to store framebuffer is not thread safe. As you cannot get_and_ref
from qdata, you may endup overriding the qdata, hence destroying the
framebuffer created buy the other sink.

This should be simple to fix since we already have a local cache of the
framebuffer object now to be able to drain.

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