4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miquel Raynal miquel.raynal@free-electrons.com
commit 87e89ce8d0d14f573c068c61bec2117751fb5103 upstream.
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()") 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/nand_base.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2320,6 +2320,7 @@ EXPORT_SYMBOL(nand_write_oob_syndrome); static int nand_do_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { + unsigned int max_bitflips = 0; int page, realpage, chipnr; struct nand_chip *chip = mtd_to_nand(mtd); struct mtd_ecc_stats stats; @@ -2377,6 +2378,8 @@ static int nand_do_read_oob(struct mtd_i nand_wait_ready(mtd); }
+ max_bitflips = max_t(unsigned int, max_bitflips, ret); + readlen -= len; if (!readlen) break; @@ -2402,7 +2405,7 @@ static int nand_do_read_oob(struct mtd_i if (mtd->ecc_stats.failed - stats.failed) return -EBADMSG;
- return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0; + return max_bitflips; }
/**