Messages in this thread Patch in this message | | | Date | Fri, 19 Mar 2021 10:23:38 +0100 | From | Miquel Raynal <> | Subject | Re: [PATCH v1] mtd: nand: Fix BBT update issue |
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Hi Yoshio,
+ Patrick
Yoshio Furuyama <ytc-mb-yfuruyama7@kioxia.com> wrote on Tue, 16 Feb 2021 09:37:55 +0900:
> Fixed issue of manages BBT (Bad Block Table). > It didn't mark correctly when a specific block was bad block. > > This issue occurs when the bad block mark (3-bit chunk) is > crosses over 32 bit (e.g. Block10, Block21...) unit. >
Thanks for the patch and sorry for the very long wait period, I wanted to understand better the issue but I didn't had the time to do it.
Would you mind having a look at Patrick's fix merged in U-Boot a year ago:
commit 06fc4573b9d0878dd1d3b302884601263fe6e85f Author: Doyle, Patrick <pdoyle@irobot.com> Date: Wed Jul 15 14:46:34 2020 +0000
Fix corner case in bad block table handling. In the unlikely event that both blocks 10 and 11 are marked as bad (on a 32 bit machine), then the process of marking block 10 as bad stomps on cached entry for block 11. There are (of course) other examples. Signed-off-by: Patrick Doyle <pdoyle@irobot.com> Reviewed-by: Richard Weinberger <richard@nod.at>
diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c index 84d60b86521..294daee7b22 100644 --- a/drivers/mtd/nand/bbt.c +++ b/drivers/mtd/nand/bbt.c @@ -127,7 +127,7 @@ int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry, unsigned int rbits = bits_per_block + offs - BITS_PER_LONG; pos[1] &= ~GENMASK(rbits - 1, 0); - pos[1] |= val >> rbits; + pos[1] |= val >> (bits_per_block - rbits); } return 0; It looks both patches fix different errors but I wonder if merging Patrick's patch first would not make more sense.
Ideally, could you please send a series with the two patches, perhaps Patrick's patch first, then yours, adding a Fixes and Cc: stable tags to both?
> Signed-off-by: Yoshio Furuyama <ytc-mb-yfuruyama7@kioxia.com> > --- > drivers/mtd/nand/bbt.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c > index 044adf913854..979c47e61381 100644 > --- a/drivers/mtd/nand/bbt.c > +++ b/drivers/mtd/nand/bbt.c > @@ -112,18 +112,20 @@ int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry, > ((entry * bits_per_block) / BITS_PER_LONG); > unsigned int offs = (entry * bits_per_block) % BITS_PER_LONG; > unsigned long val = status & GENMASK(bits_per_block - 1, 0); > + unsigned long shift = ((bits_per_block + offs <= BITS_PER_LONG) ? > + (offs + bits_per_block - 1) : (BITS_PER_LONG - 1)); > > if (entry >= nanddev_neraseblocks(nand)) > return -ERANGE; > > - pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs); > + pos[0] &= ~GENMASK(shift, offs); > pos[0] |= val << offs; > > if (bits_per_block + offs > BITS_PER_LONG) { > unsigned int rbits = bits_per_block + offs - BITS_PER_LONG; > > pos[1] &= ~GENMASK(rbits - 1, 0); > - pos[1] |= val >> rbits; > + pos[1] |= (val >> (BITS_PER_LONG - offs)); > } > > return 0;
Thanks, Miquèl
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