Patch "mtd: nand: sunxi: Fix ECC strength choice" has been added to the 4.4-stable tree

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 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mtd-nand-sunxi-fix-ecc-strength-choice.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Miquel Raynal <[email protected]>
Date: Wed, 24 Jan 2018 23:49:31 +0100
Subject: mtd: nand: sunxi: Fix ECC strength choice

From: Miquel Raynal <[email protected]>

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.

---
 drivers/mtd/nand/sunxi_nand.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

@@ -1046,8 +1046,14 @@ 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 [email protected] are

queue-4.4/mtd-nand-sunxi-fix-ecc-strength-choice.patch queue-4.4/mtd-nand-fix-nand_do_read_oob-return-value.patch