linux-kernel - Re: [PATCH linux-next] powerpc/powermac: Add missing of_node

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Date:	Mon, 08 Dec 2008 10:58:18 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Paul Mackerras <paulus@...ba.org>, Nicolas Palix <npalix@...u.dk>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, Julia Lawall <julia@...u.dk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH linux-next] powerpc/powermac: Add missing of_node_put

On Sun, 2008-12-07 at 16:43 +1100, Stephen Rothwell wrote:
> Hi Paul,
> 
> On Sun, 7 Dec 2008 13:31:00 +1100 Paul Mackerras <paulus@...ba.org> wrote:
> >
> > I'm really in two minds about applying any of the of_node_put patches
> > that only affect powermacs.  The reference counts only matter on
> > platforms where we update the OF device tree at runtime, which is
> > currently only IBM pSeries machines.  Since we don't have any hotplug
> > on powermacs, and never will have, the OF device tree is completely
> > static and we don't actually need refcounts on the nodes at all, so
> > who cares if they're a bit higher than they might be?
> > 
> > In particular, the VIA whose node we're looking for here is built-in
> > on the motherboard, and there can never be more than one, and it can
> > never be removed.
> 
> I my mind it is about consistent use of the API and good examples for
> people to copy.  Also, in about a year you will be presented with the
> same set of patches when a new pair of eyes looks at the same code and
> notices the discrepancy ...

what-he-said++

Allowing the ref counting to be broken in one part of the code is just
asking for it to be broken everywhere.

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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