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

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Date:   Fri, 2 Dec 2016 08:57:42 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Richard Weinberger <richard@....at>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 09/39] mtd: nand: denali: fix erased page check code

On Fri, 2 Dec 2016 13:33:58 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> 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.

You did. I'm waiting for the v2 now ;)

> 
> (Please tell me if there is something I missed to answer.)
> 
> Thanks a lot for your review.
> 
> 
>