[PATCH v3] cmd: mtd: check if a block has to be skipped or erased

[Mikhail Kshevetskiy]

On 24.10.2022 12:44, Dario Binacchi wrote:
> [External email]
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> From: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
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> As reported by patch [1], the `mtd erase' command should not erase bad
> blocks.
> To force bad block erasing you have to use the `mtd erase.dontskipbad'
> command.
>
> This patch tries to fix the same issue without modifying code taken
> from the linux kernel, in order to make further upgrades easier.
>
> [1] https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fall%2F20221006031501.110290-2-mikhail.kshevetskiy%40iopsys.eu%2F&data=05%7C01%7Cmikhail.kshevetskiy%40iopsys.eu%7C0ce3c4f03458440084dd08dab5a44a0e%7C7ff78d652de440f586750569e5c7a65d%7C0%7C0%7C638022014468655016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=VMQov1%2FRUmymW2G452jlOveOu2tFCE5MtzssuP2Ri3Y%3D&reserved=0
> Suggested-by: Michael Trimarchi <michael at amarulasolutions.com>
> Co-developed-by: Michael Trimarchi <michael at amarulasolutions.com>
> Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> Co-developed-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> Tested-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
> Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
>
> ---
>
> Changes in v3:
> - Simplify the code. mtd_erase() can't return a bad block error. Print
>   the messaged where the bad block is found.
>
> Changes in v2:
> - Change the commit author
> - Do not continue to erase if scrub option is enabled and a bad block
>   was found but return from the function.
> - Update the patch tags.
>
>  cmd/mtd.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/cmd/mtd.c b/cmd/mtd.c
> index ad5cc9827d55..29b2a9c04c0c 100644
> --- a/cmd/mtd.c
> +++ b/cmd/mtd.c
> @@ -434,19 +434,27 @@ static int do_mtd_erase(struct cmd_tbl *cmdtp, int flag, int argc,
>         erase_op.mtd = mtd;
>         erase_op.addr = off;
>         erase_op.len = mtd->erasesize;
> -       erase_op.scrub = scrub;
>
>         while (len) {
> -               ret = mtd_erase(mtd, &erase_op);
> -
> -               if (ret) {
> -                       /* Abort if its not a bad block error */
> -                       if (ret != -EIO)
> +               if (!scrub) {
> +                       ret = mtd_block_isbad(mtd, erase_op.addr);
> +                       if (ret < 0) {
> +                               printf("Failed to get bad block at 0x%08llx\n",
> +                                      erase_op.addr);
> +                               ret = CMD_RET_FAILURE;
> +                               goto out_put_mtd;
> +                       } else if (ret > 0) {
> +                               printf("Skipping bad block at 0x%08llx\n",
> +                                      erase_op.addr);
> +                               ret = -EIO;
>                                 break;
> -                       printf("Skipping bad block at 0x%08llx\n",
> -                              erase_op.addr);
> +                       }
>                 }
>
> +               ret = mtd_erase(mtd, &erase_op);
> +               if (ret)
> +                       break;
> +

mtd_erase() can return -EIO, see drivers/mtd/nand/spi/core.c function
spinand_mtd_erase()


>                 len -= mtd->erasesize;
>                 erase_op.addr += mtd->erasesize;
>         }
> --
> 2.32.0
>