Re: [PATCH/RFC v2 1/2] v4l: vb2: Don't return POLLERR during transient buffer underruns

[Nicolas Dufresne <nicolas.dufresne@collabora.com>]

Le 2014-09-15 09:55, Mauro Carvalho Chehab a écrit :
> The DQBUF locking fixup was merged on libv4l2 for version 1.2. So, the
> potential breakage happens when libv4l2 is 1.2 and Gstreamer versions
> before 1.4.
>
> Do you have any procedure on gstreamer to fix a bug on stable releases?
A backport is possible, even though not trivial. Also, due to resources 
there is no guaranty of a new stable 1.2 release. For GStreamer 0.10, it 
is no longer maintained since 2 years already (mentioning since Laurent 
was using an old vendor specific version base on this). Though this 
situation isn't different from using a vendor specific kernel.
> Those VBI applications don't have any, as they're not actively
> maintained anymore. Even if we patch them today, I guess it could take
> a long time for those changes to be propagated on distros.
>
> So, I guess that the best is to try to fix Gstreamer on the distros
> that are using libv4l version 1.2 and a pre-1.4 Gstreamer version.
This seems an unlikely mix, as Gst 1.4 was released at around the same 
moment as libv4l2 1.2.

cheers,
Nicolas