4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -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)) {