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mtd: eLBC NAND: fix subpage write support

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As subpage write is enabled by default for all drivers, nand_write_subpage_hwecc
causes a crash if the driver did not register ecc->hwctl or ecc->calculate.
This behavior was introduced in
   commit 837a6ba4f3
   "mtd: nand: subpage write support for hardware based ECC schemes".

This fixes a crash by emulating subpage write support by padding sub-page data
with 0xff on either sides to make it full page compatible.

Reported-by: Helmut Schaa <helmut.schaa@googlemail.com>
Tested-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Reviewed-by: Scott Wood <scottwood@freescale.com>
Cc: <stable@vger.kernel.org> # 3.10.x+
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Pekon Gupta 2014-05-06 09:41:32 +05:30 committed by Brian Norris
parent 81d46c5955
commit f034d87def
1 changed files with 14 additions and 0 deletions
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14
drivers/mtd/nand/fsl_elbc_nand.c
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@ -723,6 +723,19 @@ static int fsl_elbc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
return 0;
}
/* ECC will be calculated automatically, and errors will be detected in
* waitfunc.
*/
static int fsl_elbc_write_subpage(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t offset, uint32_t data_len,
const uint8_t *buf, int oob_required)
{
fsl_elbc_write_buf(mtd, buf, mtd->writesize);
fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
return 0;
}
static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
{
struct fsl_lbc_ctrl *ctrl = priv->ctrl;
@ -761,6 +774,7 @@ static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
chip->ecc.read_page = fsl_elbc_read_page;
chip->ecc.write_page = fsl_elbc_write_page;
chip->ecc.write_subpage = fsl_elbc_write_subpage;
/* If CS Base Register selects full hardware ECC then use it */
if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==