This is a note to let you know that I've just added the patch titled

mtd: nand: Fix nand_do_read_oob() return value

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mtd-nand-fix-nand_do_read_oob-return-value.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 87e89ce8d0d14f573c068c61bec2117751fb5103 Mon Sep 17 00:00:00 2001

From: Miquel Raynal miquel.raynal@free-electrons.com Date: Fri, 12 Jan 2018 10:13:36 +0100 Subject: mtd: nand: Fix nand_do_read_oob() return value

From: Miquel Raynal miquel.raynal@free-electrons.com

commit 87e89ce8d0d14f573c068c61bec2117751fb5103 upstream.

Starting from commit 041e4575f034 ("mtd: nand: handle ECC errors in OOB"), nand_do_read_oob() (from the NAND core) did return 0 or a negative error, and the MTD layer expected it.

However, the trend for the NAND layer is now to return an error or a positive number of bitflips. Deciding which status to return to the user belongs to the MTD layer.

Commit e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") brought this logic to the mtd_read_oob() function while the return value coming from nand_do_read_oob() (called by the ->_read_oob() hook) was left unchanged.

Fixes: e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") Signed-off-by: Miquel Raynal miquel.raynal@free-electrons.com Signed-off-by: Boris Brezillon boris.brezillon@free-electrons.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/mtd/nand/nand_base.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2320,6 +2320,7 @@ EXPORT_SYMBOL(nand_write_oob_syndrome); static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { + unsigned int max_bitflips = 0; int page, realpage, chipnr; struct nand_chip *chip = mtd_to_nand(mtd); struct mtd_ecc_stats stats; @@ -2377,6 +2378,8 @@ static int nand_do_read_oob(struct mtd_i nand_wait_ready(mtd); }

+ max_bitflips = max_t(unsigned int, max_bitflips, ret); + readlen -= len; if (!readlen) break; @@ -2402,7 +2405,7 @@ static int nand_do_read_oob(struct mtd_i if (mtd->ecc_stats.failed - stats.failed) return -EBADMSG;

- return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0; + return max_bitflips; }

/**

Patches currently in stable-queue which might be from miquel.raynal@free-electrons.com are

queue-4.9/mtd-nand-sunxi-fix-ecc-strength-choice.patch queue-4.9/mtd-nand-fix-nand_do_read_oob-return-value.patch