linux-kernel - Re: [PATCH 09/39] mtd: nand: denali: fix erased page check code

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Message-ID: <CAK7LNAS8RFs6iLNObj=HESUqWyEr8CO7B=LCCCbZ6Ki8Em96wg@mail.gmail.com>
Date:   Fri, 2 Dec 2016 13:33:58 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     linux-mtd@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH 09/39] mtd: nand: denali: fix erased page check code

Hi Boris,


2016-11-28 0:21 GMT+09:00 Boris Brezillon <boris.brezillon@...e-electrons.com>:
> On Sun, 27 Nov 2016 03:05:55 +0900
> Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:
>
>> Currently, is_erased() is called against "buf" twice, so the second
>> call is meaningless.  The second one should be checked against
>> chip->oob_poi.
>>
>
> IMO, patch 9 to 12 should be squashed in a single patch. All you're
> doing in these patch is fixing the check_erased_page logic.
>
> You can describe the different broken thing in the commit message, but
> splitting things as you do does not help much.


OK. I will do so.

I realized some mistakes in this part
(both in my patches and in the current mainline code),
so I will rework it in a more sensible chunk.


> Also, please have at nand_check_erased_ecc_chunk() [1] instead of using
> a private method (is_erased()) to check if the page is erased.
> With this method you get bitflips in erased pages correction for free.

I will use this helper, thanks!




With this, I think I answered all of your questions to v1.

(Please tell me if there is something I missed to answer.)

Thanks a lot for your review.



-- 
Best Regards
Masahiro Yamada