[Bug 758703] v4l2src: gst_v4l2_set_attribute warning messages cause infinite loop with .dot dump

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758703

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to patcherwork from comment #4)
> That calls set attribute that does no sanitization for the call. The
> alternative could be to implement a check here, but you would need to have a
> list of the available controls and cross correlate it with what you're
> calling. But that might be overkill.

We already enumerate that in the probes, We could do something smarter. I also
want to be able to get something out of "extra-controls" getter. But let's
focus on this infinit loop, as we need a proper patch for 1.6 I believe. Also,
could you provide a patch against vivid or uvc, so we can reproduce you issue ?

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