[PATCH] use msleep() for RTAS delays

[John Rose]

Hi Ben-

> What about putting this whole thing in a helper ? There is a few more
> things I've seen floating around implementing the exact same logic (for
> example Jake's MSI patches).

I don't mind writing this up.  The previous patch fixes a reported bug
with minimal reorg.  If possible, I'd like to restructure on top of
that.

> Or something inside rtas_call
> 
> rtas_call_waitbusy(...);

Certain RTAS calls expect identical inputs between successive calls,
while others (ibm,change-msi) expect modified "sequence" inputs, etc. 
Given this inconsistency, we probably can't handle busy rcs inside
rtas_call().

Thanks-
John