From ee73c81e386dfc51ba021d66324ef67a5a8fe73b Mon Sep 17 00:00:00 2001 From: =?utf8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Tue, 12 May 2020 10:24:51 +0200 Subject: [PATCH] mtd: rawnand: brcmnand: correctly verify erased pages MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit dcb351c03f2fa6a599de1061b174167e03ee312b upstream. The current code checks that the whole OOB area is erased. This is a problem when JFFS2 cleanmarkers are added to the OOB, since it will fail due to the usable OOB bytes not being 0xff. Correct this by only checking that data and ECC bytes aren't 0xff. Fixes: 02b88eea9f9c ("mtd: brcmnand: Add check for erased page bitflips") Signed-off-by: Álvaro Fernández Rojas Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200512082451.771212-1-noltari@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index 4fef207241756..3acb4327aa307 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1790,28 +1790,31 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip, static int brcmstb_nand_verify_erased_page(struct mtd_info *mtd, struct nand_chip *chip, void *buf, u64 addr) { - int i, sas; - void *oob = chip->oob_poi; + struct mtd_oob_region ecc; + int i; int bitflips = 0; int page = addr >> chip->page_shift; int ret; + void *ecc_bytes; void *ecc_chunk; if (!buf) buf = nand_get_data_buf(chip); - sas = mtd->oobsize / chip->ecc.steps; - /* read without ecc for verification */ ret = chip->ecc.read_page_raw(chip, buf, true, page); if (ret) return ret; - for (i = 0; i < chip->ecc.steps; i++, oob += sas) { + for (i = 0; i < chip->ecc.steps; i++) { ecc_chunk = buf + chip->ecc.size * i; - ret = nand_check_erased_ecc_chunk(ecc_chunk, - chip->ecc.size, - oob, sas, NULL, 0, + + mtd_ooblayout_ecc(mtd, i, &ecc); + ecc_bytes = chip->oob_poi + ecc.offset; + + ret = nand_check_erased_ecc_chunk(ecc_chunk, chip->ecc.size, + ecc_bytes, ecc.length, + NULL, 0, chip->ecc.strength); if (ret < 0) return ret; -- 2.51.0