[Bug 761940] v4l2: deadlock when using dmabuf-import (zero-copy) between two V4L2 devices

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761940

--- Comment #4 from Carlos Alberto Lopez Perez <clopez at igalia.com> ---
Finally I have applied a small patch that don't lets the bufferpool get full
and it suddenly everything works as expected.

Video playback is working fine and stable (30FPS without issue) using zero-copy
(dmabuf-import).

And the CPU usage drops to a ~[3-15]% which is much better than without
zero-copy.


I'm attaching the patch for comments.

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