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ubi: Reject MLC NAND

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While UBI and UBIFS seem to work at first sight with MLC NAND, you will
most likely lose all your data upon a power-cut or due to read/write
disturb.
In order to protect users from bad surprises, refuse to attach to MLC
NAND.

Cc: [email protected]
Signed-off-by: Richard Weinberger <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Acked-by: Artem Bityutskiy <[email protected]>
This commit is contained in:
Richard Weinberger 2018-03-03 11:45:54 +01:00
commit b5094b7f13
1 changed files with 11 additions and 0 deletions
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11
drivers/mtd/ubi/build.c
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@ -854,6 +854,17 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
return -EINVAL;
}
/*
* Both UBI and UBIFS have been designed for SLC NAND and NOR flashes.
* MLC NAND is different and needs special care, otherwise UBI or UBIFS
* will die soon and you will lose all your data.
*/
if (mtd->type == MTD_MLCNANDFLASH) {
pr_err("ubi: refuse attaching mtd%d - MLC NAND is not supported\n",
mtd->index);
return -EINVAL;
}
if (ubi_num == UBI_DEV_NUM_AUTO) {
/* Search for an empty slot in the @ubi_devices array */
for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)