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Subject[PATCH 4.14 006/164] ubi: Reject MLC NAND
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

commit b5094b7f135be34630e3ea8a98fa215715d0f29d upstream.

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: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Artem Bityutskiy <dedekind1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/mtd/ubi/build.c | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -845,6 +845,17 @@ int ubi_attach_mtd_dev(struct mtd_info *
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++)

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