Date: Thu, 8 Jun 2017 18:42:40 -0700
From: Brian Norris <computersforpeace@gmail.com>
To: Andrea Adami <andrea.adami@gmail.com>
Cc: linux-mtd@lists.infradead.org, David Woodhouse <dwmw2@infradead.org>,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        Lee Jones <lee.jones@linaro.org>, Daniel Mack <daniel@zonque.org>,
        Haojian Zhuang <haojian.zhuang@gmail.com>,
        Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
        Linus Walleij <linus.walleij@linaro.org>,
        Russell King <linux@armlinux.org.uk>, linux-mmc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 1/9] mtd: sharpslpart: add sharpslpart MTD partition
 parser
Message-ID: <20170609014240.GM102137@google.com>
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Oh, one more thing:

On Thu, Jun 01, 2017 at 12:40:50AM +0200, Andrea Adami wrote:
> diff --git a/drivers/mtd/sharpslpart.c b/drivers/mtd/sharpslpart.c
> new file mode 100644
> index 0000000..40aebe9
> --- /dev/null
> +++ b/drivers/mtd/sharpslpart.c
> @@ -0,0 +1,132 @@
> +/*
> + * MTD partition parser for NAND flash on Sharp SL Series
> + *
> + * Copyright (C) 2017 Andrea Adami <andrea.adami@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/partitions.h>
> +#include "sharpsl_ftl.h"
> +
> +/* factory defaults */
> +#define SHARPSL_NAND_PARTS		3
> +#define SHARPSL_FTL_PARTITION_SIZE	(7 * 1024 * 1024)
> +#define PARAM_BLOCK_PARTITIONINFO1	0x00060000
> +#define PARAM_BLOCK_PARTITIONINFO2	0x00064000
> +
> +#define BOOT_MAGIC			be32_to_cpu(0x424f4f54)   /* BOOT */
> +#define FSRO_MAGIC			be32_to_cpu(0x4653524f)   /* FSRO */
> +#define FSRW_MAGIC			be32_to_cpu(0x46535257)   /* FSRW */

[...]

> +struct sharpsl_nand_partitioninfo {
> +	u32 start;
> +	u32 end;

I was going to ignore this earlier, but I just noticed that you handle
endianness for the magic values above, so...

shouldn't you handle endianness for the start and end fields too?

> +	u32 magic;
> +	u32 reserved;
> +};
[...]

Brian