Re: [PATCH v7 1/6] [media] vb2: add is_unordered callback for drivers

Alexandre Courbot
2018-01-15T07:12:16Z

On Thu, Jan 11, 2018 at 1:07 AM, Gustavo Padovan <gustavo@padovan.org> wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.com>
>
> Explicit synchronization benefits a lot from ordered queues, they fit
> better in a pipeline with DRM for example so create a opt-in way for
> drivers notify videobuf2 that the queue is unordered.
>
> Drivers don't need implement it if the queue is ordered.

This is going to make user-space believe that *all* vb2 drivers use
ordered queues by default, at least until non-ordered drivers catch up
with this change. Wouldn't it be less dangerous to do the opposite
(make queues non-ordered by default)?