Boot breaks in -next from LEGACY to LINEAR conversion

On Thu, Jul 19, 2012 at 10:30:11PM -0600, Grant Likely wrote:

Okay, I've got a theory about what the issue is now. The .map()
callback is failing (returning non-zero) for one of the hwirqs. The
new code is stricter about associations, and actually unwinds the
associations if one of them fails. The old legacy code simply called
all the .map() hooks blindly without any error checking. Can you send
me the kernel log after backing out those changes.

Looks like the error checking is the issue.  Always knew that was a bad
idea :)  I've just sent a patch to improve the diagnostics here which
might help a bit, though I realise now with some of my debug I need to
send a v2 :/ .

On my system there's only one mapping failed, but it's for one of the
VIC mappings which is rather unfortunate.  The error is there because
the VIC is returning -ENOTSUPP to skip invalid IRQs which doesn't
immediately seem like an awful thing to do for generic code like this.
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