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 <scottwood@freescale.com>
Cc: Pekon Gupta <pekon@ti.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>

diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index 3405ed502bf21d339048f406e18e466c60f070aa..790d5385e0bdc18ec5172f21735f8232265b46e5 100644 (file)
--- 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;