[Bug 731015] v4l2src: deadlock on shutdown

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731015
  GStreamer | gst-plugins-good | git

Nicolas Dufresne <nicolas.dufresne> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.4.0

--- Comment #10 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-07-03 19:34:38 UTC ---
Please test as much as possible. I did a lot already, but it's a bit tricky.
Note that there is no concurrent dqbuf calls.

commit 652ed3bceb4e31fcd5dea9fdc9525fafb3350968
Author: Nicolas Dufresne <nicolas.dufresne at collabora.com>
Date:   Thu Jul 3 15:28:45 2014 -0400

    v4l2bufferpool: Wait before polling if queue is empty

    In kernel before 3.17, polling during queue underrun would unblock right
    away and trigger POLLERR. As we are not handling POLLERR, we would endup
    blocking in DQBUF call, which won't be unblocked correctly when going
    to NULL state. A deadlock at start caused by locking error in libv4l2 was
    also seen before this patch. Instead, we wait until the queue is no longer
    empty before polling.

    https://bugzilla.gnome.org/show_bug.cgi?id=731015

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