Hi Sascha,
On Wed, 2021-03-17 at 10:41 +0100, Sascha Hauer wrote:
> Hi Stefan,
>
> On Tue, Mar 16, 2021 at 01:36:26PM +0100, Stefan Riedmueller wrote:
> > The blocks containing the bad block table can become bad as well. So
> > make sure to skip any blocks that are marked bad when searching for the
> > bad block table.
>
> The file is a more or less direct copy from the kernel. Does the problem
> exist in the kernel as well?
>From my point of view I would say yes. I have just made a small test Issue is
shown in the kernel as well. It is a very raw case where two BBT blocks need
to be worn out but on the other hand this fix should not have that much of an
impact.
I will send a similar patch to the kernel.
Stefan
>
> Sascha
>
> > Signed-off-by: Stefan Riedmueller <s.riedmueller@xxxxxxxxx>
> > ---
> > drivers/mtd/nand/nand_bbt.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
> > index a86b5b2da38e..0b48373e6a0b 100644
> > --- a/drivers/mtd/nand/nand_bbt.c
> > +++ b/drivers/mtd/nand/nand_bbt.c
> > @@ -528,6 +528,7 @@ static int search_bbt(struct nand_chip *this, uint8_t
> > *buf,
> > {
> > u64 targetsize = nanddev_target_size(&this->base);
> > struct mtd_info *mtd = nand_to_mtd(this);
> > + struct nand_bbt_descr *bd = this->badblock_pattern;
> > int i, chips;
> > int startblock, block, dir;
> > int scanlen = mtd->writesize + mtd->oobsize;
> > @@ -563,6 +564,9 @@ static int search_bbt(struct nand_chip *this, uint8_t
> > *buf,
> > int actblock = startblock + dir * block;
> > loff_t offs = (loff_t)actblock << this-
> > >bbt_erase_shift;
> >
> > + /* Check if block is marked bad */
> > + if (scan_block_fast(this, bd, offs, buf))
> > + continue;
> > /* Read first page */
> > scan_read(this, buf, offs, mtd->writesize, td);
> > if (!check_pattern(buf, scanlen, mtd->writesize, td))
> > {
> > --
> > 2.25.1
> >
> >
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> >
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