Re: [PATCH] mtd: rawnand: fix return value check for bad block status

Boris Brezillon
2018-06-22T11:34:52Z

On Mon, 18 Jun 2018 15:57:57 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Hi Boris,
>
> On Wed, 13 Jun 2018 14:32:36 +0530, Abhishek Sahu
> <absahu@codeaurora.org> wrote:
>
> > 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.
> >
> > Fixes: c120e75e0e7d ("mtd: nand: use read_oob() instead of cmdfunc() for 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(-)
> >
> > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_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, loff_t ofs)
> >
> > for (; page < page_end; page++) {
> > res = chip->ecc.read_oob(mtd, chip, page);
> > - if (res)
> > + if (res < 0)
> > return res;
> >
> > bad = chip->oob_poi[chip->badblockpos];
>
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Applied.

Thanks,

Boris

>
> I suppose this patch is a good candidate to be part of a future
> mtd/fixes PR?
>
> Regards,
> Miquèl
>
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