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

mtd: nand: sunxi: Fix ECC strength choice

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-sunxi-fix-ecc-strength-choice.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 f4c6cd1a7f2275d5bc0e494b21fff26f8dde80f0 Mon Sep 17 00:00:00 2001

From: Miquel Raynal miquel.raynal@free-electrons.com Date: Wed, 24 Jan 2018 23:49:31 +0100 Subject: mtd: nand: sunxi: Fix ECC strength choice

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

commit f4c6cd1a7f2275d5bc0e494b21fff26f8dde80f0 upstream.

When the requested ECC strength does not exactly match the strengths supported by the ECC engine, the driver is selecting the closest strength meeting the 'selected_strength > requested_strength' constraint. Fix the fact that, in this particular case, ecc->strength value was not updated to match the 'selected_strength'.

For instance, one can encounter this issue when no ECC requirement is filled in the device tree while the NAND chip minimum requirement is not a strength/step_size combo natively supported by the ECC engine.

Fixes: 1fef62c1423b ("mtd: nand: add sunxi NAND flash controller support") Suggested-by: Boris Brezillon boris.brezillon@free-electrons.com 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/sunxi_nand.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1835,8 +1835,14 @@ static int sunxi_nand_hw_common_ecc_ctrl

/* Add ECC info retrieval from DT */ for (i = 0; i < ARRAY_SIZE(strengths); i++) { - if (ecc->strength <= strengths[i]) + if (ecc->strength <= strengths[i]) { + /* + * Update ecc->strength value with the actual strength + * that will be used by the ECC engine. + */ + ecc->strength = strengths[i]; break; + } }

if (i >= ARRAY_SIZE(strengths)) {

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