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

[Boris Brezillon]

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

> Hi Boris,
> 
> On Wed, 13 Jun 2018 14:32:36 +0530, Abhishek Sahu
> <absahu@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx>
> > Signed-off-by: Abhishek Sahu <absahu@xxxxxxxxxxxxxx>
> > ---
> >  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@xxxxxxxxxxx>

Applied.

Thanks,

Boris

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