From: Pekon Gupta Date: Tue, 6 May 2014 04:11:32 +0000 (+0530) Subject: mtd: eLBC NAND: fix subpage write support X-Git-Tag: android-x86-4.4-r2~1024^2~29 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f034d87def51;p=android-x86%2Fkernel.git mtd: eLBC NAND: fix subpage write support 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 837a6ba4f3b6d23026674e6af6b6849a4634fff9 "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 Tested-by: Helmut Schaa Signed-off-by: Pekon Gupta Reviewed-by: Scott Wood Cc: # 3.10.x+ Signed-off-by: Brian Norris --- diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c index ec549cd9849f..545a5c002f09 100644 --- a/drivers/mtd/nand/fsl_elbc_nand.c +++ b/drivers/mtd/nand/fsl_elbc_nand.c @@ -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) ==