linux-kernel - Re: [PATCH] ubi: Reject MLC NAND

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Date:   Wed, 07 Mar 2018 22:11:13 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Steve deRosier <derosier@...il.com>, Pavel Machek <pavel@....cz>
Cc:     Richard Weinberger <richard@....at>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        dedekind1@...il.com, tharvey@...eworks.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        marek.vasut@...il.com, linux-mtd@...ts.infradead.org,
        cyrille.pitchen@...ev4u.fr, computersforpeace@...il.com
Subject: Re: [PATCH] ubi: Reject MLC NAND



On Wed, 2018-03-07 at 14:08 -0800, Steve deRosier wrote:
> 
> To clarify one thing: the reason for this is MLC has actually never
> been supported, nor worked properly. The fact that it kinda worked was
> incidental and the cause of major problems for people due to that not
> being clear. This patch only makes it explicit and avoids people
> mistakenly trying to use UBIFS on MLC flash and risking their data and
> products. To me, that's what's important.
> 
> This is an important patch, even if all it does is keep people from
> loosing data. It also changes the conversation from "I have a
> corrupted UBIFS device, BTW it's on MLC..." to "What can we do to get
> UBIFS to work on MLC".

This is a bug fix.

UBI on MLC never worked. It was a bug that we ever permitted it. This
is now fixed.

Actually making UBI on MLC *work* would be a feature, and wouldn't be
backported to stable. But this one is *absolutely* appropriate for a
stable backport.
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