linux-kernel - Re: [PATCH 3/3] mtd: cmdlinepart: fix the wrong partitions number when truncating occurs

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Message-ID: <1346309023.2848.531.camel@sauron.fi.intel.com>
Date:	Thu, 30 Aug 2012 09:43:43 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Huang Shijie <shijie8@...il.com>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, shmulik.ladkani@...il.com
Subject: Re: [PATCH 3/3] mtd: cmdlinepart: fix the wrong partitions number
 when truncating occurs

On Sun, 2012-08-26 at 13:21 -0400, Huang Shijie wrote:
> This patch is based on the assumption that all the partitions are
> in the right offset order.
> 
> Assume we have a 1GB(8Gb) nand chip, and we set the partitions
> in the command line like this:
>     #gpmi-nand:100m(boot),100m(kernel),1g(rootfs)
> 
> In this case, the partition truncating occurs. The current code will
> get the following result:
> 
>      ----------------------------------
> 	root@...escale ~$ cat /proc/mtd
> 	dev:    size   erasesize  name
> 	mtd0: 06400000 00040000 "boot"
> 	mtd1: 06400000 00040000 "kernel"
>      ----------------------------------
> 
> It is obvious that we lost the truncated partition `rootfs` which should
> be 824M in this case.
> 
> Why? The old code sets the wrong partitions number when the truncating
> occurs. This patch fixes it. Alao add a `break` to shortcut the code in this
> case.
> 
> After apply this patch, the result becomes:
>      ----------------------------------
> 	root@...escale ~$ cat /proc/mtd
> 	dev:    size   erasesize  name
> 	mtd0: 06400000 00040000 "boot"
> 	mtd1: 06400000 00040000 "kernel"
> 	mtd2: 33800000 00040000 "rootfs"
>      ----------------------------------
> 
> We get the right result.
> 
> Signed-off-by: Huang Shijie <shijie8@...il.com>

Should this have CC to -stable?

-- 
Best Regards,
Artem Bityutskiy

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