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SubjectRe: [PATCH v3 4/5] mtd_blkdevs: add option to enable scanning for partitions
Hi Daniel,

daniel@makrotopia.org wrote on Thu, 12 May 2022 20:39:27 +0100:

> Add Kconfig boolean CONFIG_MTD_BLOCK_PARTITIONS and enable block
> partition parsers on non-NAND mtdblock devices in case it is selected.
>
> Signed-off-by: Daniel Golle <daniel@makrotopia.org>
> ---
> drivers/mtd/Kconfig | 11 +++++++++++
> drivers/mtd/mtd_blkdevs.c | 4 +++-
> 2 files changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
> index 796a2eccbef0b8..12874dec15692a 100644
> --- a/drivers/mtd/Kconfig
> +++ b/drivers/mtd/Kconfig
> @@ -69,6 +69,17 @@ config MTD_BLOCK_RO
> You do not need this option for use with the DiskOnChip devices. For
> those, enable NFTL support (CONFIG_NFTL) instead.
>
> +config MTD_BLOCK_PARTITIONS
> + bool "Scan for partitions on MTD block devices"
> + depends on MTD_BLOCK || MTD_BLOCK_RO
> + default y if FIT_PARTITION
> + help
> + Scan MTD block devices for partitions (ie. MBR, GPT, uImage.FIT, ...).
> + (NAND devices are omitted, ubiblock should be used instead when)
> +
> + Unless your MTD partitions contain sub-partitions mapped using a
> + partition table, say no.
> +
> comment "Note that in some cases UBI block is preferred. See MTD_UBI_BLOCK."
> depends on MTD_BLOCK || MTD_BLOCK_RO
>
> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> index f7317211146550..c67ce2e6fbeb0a 100644
> --- a/drivers/mtd/mtd_blkdevs.c
> +++ b/drivers/mtd/mtd_blkdevs.c
> @@ -359,7 +359,9 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
> } else {
> snprintf(gd->disk_name, sizeof(gd->disk_name),
> "%s%d", tr->name, new->devnum);
> - gd->flags |= GENHD_FL_NO_PART;
> +
> + if (!IS_ENABLED(CONFIG_MTD_BLOCK_PARTITIONS) || mtd_type_is_nand(new->mtd))
> + gd->flags |= GENHD_FL_NO_PART;

I really wonder if we need this in mtdblock ? Isn't ubiblock enough?

Anyhow,
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>

I'll let Richard ack the ubiblock patch.

Thanks,
Miquèl

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