[PATCH] drm: Don't prepare or cleanup unchanging frame buffers [v2]

[Keith Packard]

Daniel Vetter <daniel at ffwll.ch> writes:

> Hm, I can't see v1 anywhere, but I think it'd be better. You can't store
> any transient state related to the current update in struct drm_plane. In
> this case the cleanup_buffers from a previous update might overlap (for
> nonblocking atomic commits) with the prepare_planes for the next one.
> Either we need special cleanup vs. error-path code, or some flag somewhere
> in the drm_plane_state.

Ok, here's pretty much the previous version, which works now that I've
fixed the intel driver. Instead of just comparing the fb's, I'm using
the framebuffer_changed function, which seems like a nice bit of
documentation if nothing else.

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-- 
-keith
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