The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 36415a7964711822e63695ea67fede63979054d9 Mon Sep 17 00:00:00 2001 From: david regan dregan@mail.com Date: Wed, 26 Jan 2022 23:43:44 +0100 Subject: [PATCH] mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status

The brcmnand driver contains a bug in which if a page (example 2k byte) is read from the parallel/ONFI NAND and within that page a subpage (512 byte) has correctable errors which is followed by a subpage with uncorrectable errors, the page read will return the wrong status of correctable (as opposed to the actual status of uncorrectable.)

The bug is in function brcmnand_read_by_pio where there is a check for uncorrectable bits which will be preempted if a previous status for correctable bits is detected.

The fix is to stop checking for bad bits only if we already have a bad bits status.

Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB NAND controller") Signed-off-by: david regan dregan@mail.com Reviewed-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/trinity-478e0c09-9134-40e8-8f8c-31c371225e...

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index f75929783b94..aee78f5f4f15 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -2106,7 +2106,7 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip, mtd->oobsize / trans, host->hwcfg.sector_size_1k);

- if (!ret) { + if (ret != -EBADMSG) { *err_addr = brcmnand_get_uncorrecc_addr(ctrl);

if (*err_addr)