linux-kernel - Re: mc13xxx-core: kernel hangs after 'regmap

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Message-ID: <20120524163752.GN5361@opensource.wolfsonmicro.com>
Date:	Thu, 24 May 2012 17:37:53 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Marc Reilly <marc@...esign.com.au>
Cc:	Shawn Guo <shawn.guo@...escale.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Philippe Rétornaz <philippe.retornaz@...l.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: mc13xxx-core: kernel hangs after 'regmap_read'

On Thu, May 24, 2012 at 11:06:08PM +1000, Marc Reilly wrote:

> -	map->format.buf_size = (config->reg_bits + config->val_bits) / 8;
> +	map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
> +					    config->val_bits +
> +					    config->pad_bits % 8, 8);

Yup, though probably without the % 8 (I'd need to reread the context to
confirm) as if pad_bits isn't a multiple of 8 you ought to find that
reg_bits isn't either.
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