3.16.60-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Richard Weinberger <[email protected]> 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. Signed-off-by: Richard Weinberger <[email protected]> Acked-by: Boris Brezillon <[email protected]> Acked-by: Artem Bityutskiy <[email protected]> Signed-off-by: Ben Hutchings <[email protected]> --- drivers/mtd/ubi/build.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -905,6 +905,17 @@ 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++)
