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Message-Id: <20220223174431.1083-3-f.fainelli@gmail.com> Date: Wed, 23 Feb 2022 09:44:31 -0800 From: Florian Fainelli <f.fainelli@...il.com> To: stable@...r.kernel.org Cc: gregkh@...uxfoundation.org, sashal@...nel.org, david regan <dregan@...l.com>, Florian Fainelli <f.fainelli@...il.com>, Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, Brian Norris <computersforpeace@...il.com>, linux-mtd@...ts.infradead.org (open list:NAND FLASH SUBSYSTEM), linux-kernel@...r.kernel.org (open list) Subject: [PATCH RESEND stable 4.9] mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status From: david regan <dregan@...l.com> commit 36415a7964711822e63695ea67fede63979054d9 upstream 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@...l.com> Reviewed-by: Florian Fainelli <f.fainelli@...il.com> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com> Link: https://lore.kernel.org/linux-mtd/trinity-478e0c09-9134-40e8-8f8c-31c371225eda-1643237024774@3c-app-mailcom-lxa02 [florian: make patch apply to 4.14, file was renamed] Signed-off-by: Florian Fainelli <f.fainelli@...il.com> --- drivers/mtd/nand/brcmnand/brcmnand.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c index 40fdc9d267b9..1c8e95cf29d2 100644 --- a/drivers/mtd/nand/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/brcmnand/brcmnand.c @@ -1637,7 +1637,7 @@ 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_read_reg(ctrl, BRCMNAND_UNCORR_ADDR) | ((u64)(brcmnand_read_reg(ctrl, -- 2.25.1
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