[Question]: What's right way to use struct media_pipeline?

[Bryan Wu <pengw@nvidia.com>]

Hi Hans,

I found struct media_pipeline actually is completely empty and I assume 
we use that to control all the entities belonging to one media_pipeline.

media_pipeline should contains either all the media_link or all the 
media_entity. How come an empty struct can provide those information?

What about following ideas?
1. when media_entity_create_links, it will return a media_link pointer.
2. we save this media_link pointer into the media_pipeline
3. use this media_pipeline for start streaming, stop streaming and 
validate links.

Maybe I miss something during recent media controller changes.

Thanks,
-Bryan

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