From 03b1d11a998b70df2ca699a9b9fb8ab5b0746d43 Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Mon, 6 Jun 2016 13:59:14 +0200 Subject: [PATCH] mtd: nand: sunxi: fix subpage write Implement ecc->write_subpage() to prevent core code from assigning this hook to nand_write_subpage_hwecc(). This default implementation tries to call ecc->hwctl() which in our case is NULL, thus leading to a NULL pointer dereference. Signed-off-by: Boris Brezillon --- drivers/mtd/nand/sunxi_nand.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index 6e319bace724..f582fe41d61d 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1352,6 +1352,36 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd, return 0; } +static int sunxi_nfc_hw_ecc_write_subpage(struct mtd_info *mtd, + struct nand_chip *chip, + u32 data_offs, u32 data_len, + const u8 *buf, int oob_required, + int page) +{ + struct nand_ecc_ctrl *ecc = &chip->ecc; + int ret, i, cur_off = 0; + + sunxi_nfc_hw_ecc_enable(mtd); + + for (i = data_offs / ecc->size; + i < DIV_ROUND_UP(data_offs + data_len, ecc->size); i++) { + int data_off = i * ecc->size; + int oob_off = i * (ecc->bytes + 4); + const u8 *data = buf + data_off; + const u8 *oob = chip->oob_poi + oob_off; + + ret = sunxi_nfc_hw_ecc_write_chunk(mtd, data, data_off, oob, + oob_off + mtd->writesize, + &cur_off, !i, page); + if (ret) + return ret; + } + + sunxi_nfc_hw_ecc_disable(mtd); + + return 0; +} + static int sunxi_nfc_hw_ecc_write_page_dma(struct mtd_info *mtd, struct nand_chip *chip, const u8 *buf, @@ -1864,7 +1894,8 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct mtd_info *mtd, ecc->write_page = sunxi_nfc_hw_ecc_write_page; } - /* TODO: support DMA for raw accesses */ + /* TODO: support DMA for raw accesses and subpage write */ + ecc->write_subpage = sunxi_nfc_hw_ecc_write_subpage; ecc->read_oob_raw = nand_read_oob_std; ecc->write_oob_raw = nand_write_oob_std; ecc->read_subpage = sunxi_nfc_hw_ecc_read_subpage; -- 2.39.5