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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-03-30 15:45:47 +0900 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-04-25 14:18:31 +0200 |
| commit | 07604686e808cd93d352172806a7828860f048f5 (patch) | |
| tree | cf462396e69f6c7a61dead633765e555deaf6de4 | |
| parent | f107d7a43923a83d837b3ea3c7b7de58cd014bbd (diff) | |
| download | op-kernel-dev-07604686e808cd93d352172806a7828860f048f5.zip op-kernel-dev-07604686e808cd93d352172806a7828860f048f5.tar.gz | |
mtd: nand: relax ecc.read_page() return value for uncorrectable ECC
The comment for ecc.read_page() requires that it should return
"0 if bitflips uncorrectable".
Actually, drivers could return positive values when uncorrectable
bitflips occur. For example, nand_read_page_swecc() is the case.
If ecc.correct() returns -EBADMSG for the first ECC sector, and
a positive value for the second one, nand_read_page_swecc() returns
a positive max_bitflips and increments ecc_stats.failed for the same
page.
The requirement can be relaxed by tweaking nand_do_read_ops().
Move the max_bitflips calculation below the retry.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 3 | ||||
| -rw-r--r-- | include/linux/mtd/nand.h | 2 |
2 files changed, 2 insertions, 3 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 36258e6..de6c804 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -1993,8 +1993,6 @@ read_retry: break; } - max_bitflips = max_t(unsigned int, max_bitflips, ret); - /* Transfer not aligned data */ if (use_bufpoi) { if (!NAND_HAS_SUBPAGE_READ(chip) && !oob && @@ -2045,6 +2043,7 @@ read_retry: } buf += bytes; + max_bitflips = max_t(unsigned int, max_bitflips, ret); } else { memcpy(buf, chip->buffers->databuf + col, bytes); buf += bytes; diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 4065793..9e0c93c 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -516,7 +516,7 @@ static inline void nand_hw_control_init(struct nand_hw_control *nfc) * out-of-band data). * @read_page: function to read a page according to the ECC generator * requirements; returns maximum number of bitflips corrected in - * any single ECC step, 0 if bitflips uncorrectable, -EIO hw error + * any single ECC step, -EIO hw error * @read_subpage: function to read parts of the page covered by ECC; * returns same as read_page() * @write_subpage: function to write parts of the page covered by ECC. |
