linux-kernel - Re: [PATCH 2/3] of: Introduce safe accessors for node->data

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Date:	Tue, 9 Feb 2010 10:25:22 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Michal Simek <monstr@...str.eu>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	microblaze-uclinux@...e.uq.edu.au
Subject: Re: [PATCH 2/3] of: Introduce safe accessors for node->data

On Fri, Feb 5, 2010 at 1:50 PM, Anton Vorontsov
<avorontsov@...mvista.com> wrote:
> Platform code use node->data to store some private information
> associated with a node.
>
> Previously there was no need for any locks and accessors since we were
> initializing the data mostly at boot time and never modified it later.
>
> Though, nowadays OF GPIO infrastructure supports GPIO chips detaching,
> so to handle this correctly we have to introduce locking for the
> node->data field.

I'm not convinced this is needed.  What's wrong with using the
whole-tree devtree_lock?

g.
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