Re: [PATCH v2 3/9] mtd: rawnand: onfi: Fix redundancy detection check

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Hi Boris,

Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Sat, 25 Apr
2020 10:22:25 +0200:

> On Fri, 24 Apr 2020 18:40:36 +0200
> Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:
> 
> > During ONFI detection, the CRC derived from the parameter page and the
> > CRC supposed to be at the end of the parameter page are compared. If
> > they do not match, the second then the third copies of the page are
> > tried.
> > 
> > The current implementation compares the newly derived CRC with the CRC
> > contained in the first page only. So if this particular CRC area has
> > been corrupted, then the detection will fail for a wrong reason.
> > 
> > Fix this issue by checking the derived CRC against the right one.
> >   
> 

Yes, but given the fact that we moved this code out of nand_base.c
sending it to stable would not apply, I don't know what's best in this
case?

The faulty commit being
39138c1f4a31 mtd: rawnand: use bit-wise majority to recover the ONFI param page

> This one probably deserves Fixes and Cc-stable tags.
> 
> > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> > Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> > ---
> >  drivers/mtd/nand/raw/nand_onfi.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
> > index 0b879bd0a68c..8fe8d7bdd203 100644
> > --- a/drivers/mtd/nand/raw/nand_onfi.c
> > +++ b/drivers/mtd/nand/raw/nand_onfi.c
> > @@ -173,7 +173,7 @@ int nand_onfi_detect(struct nand_chip *chip)
> >  		}
> >  
> >  		if (onfi_crc16(ONFI_CRC_BASE, (u8 *)&p[i], 254) ==
> > -				le16_to_cpu(p->crc)) {
> > +		    le16_to_cpu(p[i].crc)) {
> >  			if (i)
> >  				memcpy(p, &p[i], sizeof(*p));
> >  			break;  
> 

Thanks,
Miquèl

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