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mtd: rawnand: Ensure the number of bitflips is consistent

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The main NAND read page function can loop over "page reads" many times
in if the reading reports uncorrectable error(s) and if the chip
supports the read_retry feature.

In this case, the number of bitflips is summarized between
attempts. Fix this by re-initializing the entire mtd_ecc_stats object
each time we retry.

Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200519074549.23673-4-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal
2020-05-19 09:45:44 +02:00
parent 1759279ad1
commit 0651ed5082
1 changed files with 5 additions and 5 deletions
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10
drivers/mtd/nand/raw/nand_base.c
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@@ -3295,7 +3295,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
oob_required = oob ? 1 : 0;
while (1) {
unsigned int ecc_failures = mtd->ecc_stats.failed;
struct mtd_ecc_stats ecc_stats = mtd->ecc_stats;
bytes = min(mtd->writesize - col, readlen);
aligned = (bytes == mtd->writesize);
@@ -3346,7 +3346,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
*/
if (use_bounce_buf) {
if (!NAND_HAS_SUBPAGE_READ(chip) && !oob &&
!(mtd->ecc_stats.failed - ecc_failures) &&
!(mtd->ecc_stats.failed - ecc_stats.failed) &&
(ops->mode != MTD_OPS_RAW)) {
chip->pagecache.page = realpage;
chip->pagecache.bitflips = ret;
@@ -3369,7 +3369,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
nand_wait_readrdy(chip);
if (mtd->ecc_stats.failed - ecc_failures) {
if (mtd->ecc_stats.failed - ecc_stats.failed) {
if (retry_mode + 1 < chip->read_retries) {
retry_mode++;
ret = nand_setup_read_retry(chip,
@@ -3377,8 +3377,8 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
if (ret < 0)
break;
/* Reset failures; retry */
mtd->ecc_stats.failed = ecc_failures;
/* Reset ecc_stats; retry */
mtd->ecc_stats = ecc_stats;
goto read_retry;
} else {
/* No more retry modes; real failure */