| Message ID | 1465214354-31493-4-git-send-email-boris.brezillon@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 6 Jun 2016 13:59:14 +0200 Boris Brezillon <boris.brezillon@free-electrons.com> wrote: Oops, I forgot to add this commit message: " 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 <boris.brezillon@free-electrons.com> > --- > 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 252cbbf..409acbe 100644 > --- a/drivers/mtd/nand/sunxi_nand.c > +++ b/drivers/mtd/nand/sunxi_nand.c > @@ -1350,6 +1350,36 @@ 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, > @@ -1862,7 +1892,8 @@ 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;
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index 252cbbf..409acbe 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1350,6 +1350,36 @@ 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, @@ -1862,7 +1892,8 @@ 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;
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> --- drivers/mtd/nand/sunxi_nand.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-)