linux-kernel - Re: [PATCH] drivers: regmap: bugfix in regcache-rbtree.c

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Message-ID: <20130821140816.GC26118@sirena.org.uk>
Date:	Wed, 21 Aug 2013 15:08:16 +0100
From:	Mark Brown <broonie@...nel.org>
To:	David Jander <david.jander@...tonic.nl>
Cc:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: regmap: bugfix in regcache-rbtree.c

On Wed, Aug 21, 2013 at 03:14:23PM +0200, David Jander wrote:

> Here's the explanation:

> 1. If a driver initializes a regmap with a RB-tree cache, and starts writing to
> registers in some arbitrary order, you might get overlapping rbnodes:
> Suppose I have this rb-tree (a real case I happen to have):

> # cat /sys/kernel/debug/regmap/1-000a/rbtree
> 2-19 (24)
> 4-1b (24)

Like I say this isn't supposed to be the case in the first place, those
two nodes should be being merged - what we need to understand is where
the overlapping nodes came from.

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