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Date: Fri, 22 Jun 2018 13:34:36 +0200
From: Boris Brezillon <boris.brezillon@bootlin.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Abhishek Sahu <absahu@codeaurora.org>, Marek Vasut
 <marek.vasut@gmail.com>, linux-arm-msm@vger.kernel.org,
 linux-kernel@vger.kernel.org, stable@vger.kernel.org,
 linux-mtd@lists.infradead.org, Richard Weinberger <richard@nod.at>, Brian
 Norris <computersforpeace@gmail.com>, David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH] mtd: rawnand: fix return value check for bad block status
Message-ID: <20180622133436.39e1466d@bbrezillon>
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 <20180618155757.6cbe0fae@xps13>
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On Mon, 18 Jun 2018 15:57:57 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Hi Boris,
>=20
> On Wed, 13 Jun 2018 14:32:36 +0530, Abhishek Sahu
> <absahu@codeaurora.org> wrote:
>=20
> > Positive return value from read_oob() is making false BAD
> > blocks. For some of the NAND controllers, OOB bytes will be
> > protected with ECC and read_oob() will return number of bitflips.
> > If there is any bitflip in ECC protected OOB bytes for BAD block
> > status page, then that block is getting treated as BAD.
> >=20
> > Fixes: c120e75e0e7d ("mtd: nand: use read_oob() instead of cmdfunc() fo=
r bad block check")
> > Cc: <stable@vger.kernel.org>
> > Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
> > ---
> >  drivers/mtd/nand/raw/nand_base.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >=20
> > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/na=
nd_base.c
> > index f28c3a5..4a73f73 100644
> > --- a/drivers/mtd/nand/raw/nand_base.c
> > +++ b/drivers/mtd/nand/raw/nand_base.c
> > @@ -440,7 +440,7 @@ static int nand_block_bad(struct mtd_info *mtd, lof=
f_t ofs)
> > =20
> >  	for (; page < page_end; page++) {
> >  		res =3D chip->ecc.read_oob(mtd, chip, page);
> > -		if (res)
> > +		if (res < 0)
> >  			return res;
> > =20
> >  		bad =3D chip->oob_poi[chip->badblockpos]; =20
>=20
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Applied.

Thanks,

Boris

>=20
> I suppose this patch is a good candidate to be part of a future
> mtd/fixes PR?
>=20
> Regards,
> Miqu=C3=A8l
>=20
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