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mtd: rawnand: stm32_fmc2: fix ECC overwrite 

In case OOB write is requested during a data write, ECC is currently
lost. Avoid this issue by only writing in the free spare area.
This issue has been seen with a YAFFS2 file system.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Cc: stable@vger.kernel.org
Fixes: 2cd457f328 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Christophe Kerello 2025-08-12 09:30:08 +02:00 committed by Miquel Raynal
parent 513c40e59d
commit 811c0da454
1 changed files with 15 additions and 3 deletions
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18
drivers/mtd/nand/raw/stm32_fmc2_nand.c
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@ -985,9 +985,21 @@ static int stm32_fmc2_nfc_seq_write(struct nand_chip *chip, const u8 *buf,
/* Write oob */
if (oob_required) {
ret = nand_change_write_column_op(chip, mtd->writesize,
chip->oob_poi, mtd->oobsize,
false);
unsigned int offset_in_page = mtd->writesize;
const void *buf = chip->oob_poi;
unsigned int len = mtd->oobsize;
if (!raw) {
struct mtd_oob_region oob_free;
mtd_ooblayout_free(mtd, 0, &oob_free);
offset_in_page += oob_free.offset;
buf += oob_free.offset;
len = oob_free.length;
}
ret = nand_change_write_column_op(chip, offset_in_page,
buf, len, false);
if (ret)
return ret;
}