[patch 2/5] Staging: vme: add VME userspace driver

Emilio G. Cota cota at braap.org
Tue Aug 11 21:01:46 UTC 2009


Martyn Welch wrote:
> I disagree. The bridge drivers should register their resources with the  
> core. The core, or a layer above it, can control how those resources are  
> used. This moves the complexity you want for managing the windows to a  
> level that will work on all underlying drivers rather than having to be  
> written explicitly for each one. The mechanism I have provided does this  
> discovery.

nah, it would be foolish to think we can write an upper layer
that covers every corner case for every bridge we're gonna
encounter. For instance, imagine a bridge that has 10 windows,
with the annoying feature that window#10 *only* accepts CS/CSR
mappings. How stupid is that? Very stupid. But what would be
more stupid is to write allegedly 'generic' interfaces that
break every time a bridge comes up with a stupid feature.

So that doesn't belong to a generic interface. Now, to avoid
code duplication between two (or more) _very_ similar bridges,
we just share the 'resource management' code among those,
privately. And that's pretty much it.

Regards,
E.



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