The ONFI spec clearly says that FAIL bit is only valid for PROGRAM,
ERASE and READ-with-on-die-ECC operations, and should be ignored
otherwise.
It seems that checking it after sending a SET_FEATURES is a bad idea
because a previous READ, PROGRAM or ERASE op may have failed, and
depending on the implementation, the FAIL bit is not cleared until a
new READ, PROGRAM or ERASE is started.
This leads to ->set_features() returning -EIO while it actually worked,
which can sometimes stop a batch of READ/PROGRAM ops.
Note that we only fix the ->exec_op() path here, because some drivers
are abusing the NAND_STATUS_FAIL flag in their ->waitfunc()
implementation to propagate other kind of errors, like
wait-ready-timeout or controller-related errors. Let's not try to fix
those drivers since they worked fine so far.
Fixes: 8878b126df76 ("mtd: nand: add ->exec_op() implementation")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
---
This patch is fixing a problem we had with on-die ECC on Micron
NANDs [1].
On these chips, when you have an ECC failure, the FAIL bit is set and
it's not cleared until the next READ operation, which led the following
SET_FEATURES (used to re-enable on-die ECC) to fail with -EIO and
stopped the batch of page reads started by UBIFS, which in turn led to
unmountable FS.
[1]http://patchwork.ozlabs.org/patch/907874/
Changes in v2:
- Fix the subject prefix
---
drivers/mtd/nand/raw/nand_base.c | 27 +++++++++------------------
1 file changed, 9 insertions(+), 18 deletions(-)
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f28c3a555861..ee29f34562ab 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -2174,7 +2174,6 @@ static int nand_set_features_op(struct nand_chip *chip, u8 feature,
struct mtd_info *mtd = nand_to_mtd(chip);
const u8 *params = data;
int i, ret;
- u8 status;
if (chip->exec_op) {
const struct nand_sdr_timings *sdr =
@@ -2188,26 +2187,18 @@ static int nand_set_features_op(struct nand_chip *chip, u8 feature,
};
struct nand_operation op = NAND_OPERATION(instrs);
- ret = nand_exec_op(chip, &op);
- if (ret)
- return ret;
-
- ret = nand_status_op(chip, &status);
- if (ret)
- return ret;
- } else {
- chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, feature, -1);
- for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
- chip->write_byte(mtd, params[i]);
+ return nand_exec_op(chip, &op);
+ }
- ret = chip->waitfunc(mtd, chip);
- if (ret < 0)
- return ret;
+ chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, feature, -1);
+ for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
+ chip->write_byte(mtd, params[i]);
- status = ret;
- }
+ ret = chip->waitfunc(mtd, chip);
+ if (ret < 0)
+ return ret;
- if (status & NAND_STATUS_FAIL)
+ if (ret & NAND_STATUS_FAIL)
return -EIO;
return 0;
--
2.14.1
