linux-kernel - Re: [PATCH] regmap: Add function check before called format

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Date:	Mon, 20 Jul 2015 16:02:54 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Henry Chen <henryc.chen@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, eddie.huang@...iatek.com
Subject: Re: [PATCH] regmap: Add function check before called format_val

On Mon, Jul 20, 2015 at 08:41:50PM +0800, Henry Chen wrote:
> The regmap_format will not be initialize since regmap_bus is not assgined 
> on regmap_init(). It should has a function check before using 
> format_val() to avoid null function called on regmap_bulk_read().

> -			map->format.format_val(val + (i * val_bytes), ival, 0);
> +			if (map->format.format_val)
> +				map->format.format_val(val + (i * val_bytes), ival, 0);
> +			else
> +				memcpy(val + (i * val_bytes), &ival, val_bytes);

Your changelog doesn't explan why we are in this code path in the first
place without a format_val() and why a memcpy() is an appropriate
replacement.  It should, it's not clear to me that this is a good fix
but I don't feel I fully understand the problem.

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