From fcd052457434d1f86c4e6d5f90d838210ab87d8b Mon Sep 17 00:00:00 2001 From: Nikita Kiryanov Date: Tue, 17 Dec 2013 15:18:01 +0200 Subject: [PATCH] mtd: nand: omap: fix ecc ops assignment when changing ecc If we change to software ecc and then back to hardware ecc, the nand ecc ops pointers are populated with incorrect function pointers. This is related to the way nand_scan_tail() handles assigning functions to ecc ops: If we are switching to software ecc/no ecc, it assigns default functions to the ecc ops pointers unconditionally, but if we are switching to hardware ecc, the default hardware ecc functions are assigned to ops pointers only if these pointers are NULL (so that drivers could set their own functions). In the case of omap_gpmc.c driver, when we switch to sw ecc, sw ecc functions are assigned to ecc ops by nand_scan_tail(), and when we later switch to hw ecc, the ecc ops pointers are not NULL, so nand_scan_tail() does not overwrite them with hw ecc functions. The result: sw ecc functions used to write hw ecc data. Clear the ecc ops pointers in omap_gpmc.c when switching ecc types, so that ops which were not assigned by the driver will get the correct default values from nand_scan_tail(). Cc: Scott Wood Cc: Pekon Gupta Signed-off-by: Nikita Kiryanov --- drivers/mtd/nand/omap_gpmc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index 3405ed502b..790d5385e0 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -791,6 +791,7 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, bch_priv.control = NULL; bch_priv.type = 0; /* populate ecc specific fields */ + memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; nand->ecc.strength = 1; nand->ecc.size = SECTOR_BYTES; @@ -829,6 +830,7 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, } bch_priv.type = ECC_BCH8; /* populate ecc specific fields */ + memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; nand->ecc.strength = 8; nand->ecc.size = SECTOR_BYTES; @@ -871,6 +873,7 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, elm_init(); bch_priv.type = ECC_BCH8; /* populate ecc specific fields */ + memset(&nand->ecc, 0, sizeof(struct nand_ecc_ctrl)); nand->ecc.mode = NAND_ECC_HW; nand->ecc.strength = 8; nand->ecc.size = SECTOR_BYTES; -- 2.39.2