Starting from commit 041e4575f034 ("mtd: nand: handle ECC errors in OOB"), nand_do_read_oob() (from the NAND core) did return 0 or a negative error, and the MTD layer expected it.
However, the trend for the NAND layer is now to return an error or a positive number of bitflips. Deciding which status to return to the user belongs to the MTD layer.
Commit e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") brought this logic to the mtd_read_oob() function while the return value coming from nand_do_read_oob() (called by the ->_read_oob() hook) was left unchanged.
Fixes: e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@free-electrons.com ---
Changes since v1: - s/->ecc.read_oob() hook/->_read_oob() hook/ in the commit message - Fixed the compilation issue
drivers/mtd/nand/nand_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 469220065b8b..440d9f5d5b17 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3876,7 +3876,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, if (mtd->ecc_stats.failed - stats.failed) return -EBADMSG;
- return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0; + return ret; }
/**
On Thu, 11 Jan 2018 22:42:02 +0100 Miquel Raynal miquel.raynal@free-electrons.com wrote:
Starting from commit 041e4575f034 ("mtd: nand: handle ECC errors in OOB"), nand_do_read_oob() (from the NAND core) did return 0 or a negative error, and the MTD layer expected it.
However, the trend for the NAND layer is now to return an error or a positive number of bitflips. Deciding which status to return to the user belongs to the MTD layer.
Commit e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") brought this logic to the mtd_read_oob() function while the return value coming from nand_do_read_oob() (called by the ->_read_oob() hook) was left unchanged.
Fixes: e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@free-electrons.com
Changes since v1:
- s/->ecc.read_oob() hook/->_read_oob() hook/ in the commit message
- Fixed the compilation issue
drivers/mtd/nand/nand_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 469220065b8b..440d9f5d5b17 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3876,7 +3876,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, if (mtd->ecc_stats.failed - stats.failed) return -EBADMSG;
- return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
- return ret;
This is wrong, you're only returning the max number of bitflips of the last OOB read.
} /**
Hi Boris,
On Fri, 12 Jan 2018 08:52:25 +0100 Boris Brezillon boris.brezillon@free-electrons.com wrote:
On Thu, 11 Jan 2018 22:42:02 +0100 Miquel Raynal miquel.raynal@free-electrons.com wrote:
Starting from commit 041e4575f034 ("mtd: nand: handle ECC errors in OOB"), nand_do_read_oob() (from the NAND core) did return 0 or a negative error, and the MTD layer expected it.
However, the trend for the NAND layer is now to return an error or a positive number of bitflips. Deciding which status to return to the user belongs to the MTD layer.
Commit e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") brought this logic to the mtd_read_oob() function while the return value coming from nand_do_read_oob() (called by the ->_read_oob() hook) was left unchanged.
Fixes: e47f68587b82 ("mtd: check for max_bitflips in mtd_read_oob()") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@free-electrons.com
Changes since v1:
- s/->ecc.read_oob() hook/->_read_oob() hook/ in the commit
message
- Fixed the compilation issue
drivers/mtd/nand/nand_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 469220065b8b..440d9f5d5b17 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3876,7 +3876,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, if (mtd->ecc_stats.failed - stats.failed) return -EBADMSG;
- return mtd->ecc_stats.corrected - stats.corrected ?
-EUCLEAN : 0;
- return ret;
This is wrong, you're only returning the max number of bitflips of the last OOB read.
I forgot about the while loop, that's right.
There will be a v3 :)
Thanks, Miquèl
linux-stable-mirror@lists.linaro.org
-
Boris Brezillon -
Miquel Raynal