mtd: kill MTD_NAND_VERIFY_WRITE

Just as Artem suggested:

"Both UBI and JFFS2 are able to read verify what they wrote already.
There are also MTD tests which do this verification. So I think there
is no reason to keep this in the NAND layer, let alone wasting RAM in
the driver to support this feature. Besides, it does not work for sub-pages
and many drivers have it broken. It hurts more than it provides benefits."

So kill MTD_NAND_VERIFY_WRITE entirely.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 0 insertions, 13 deletions

diff --git a/drivers/mtd/nand/ndfc.c b/drivers/mtd/nand/ndfc.c
index 2b6f632..5fd3f01 100644
--- a/drivers/mtd/nand/ndfc.c
+++ b/drivers/mtd/nand/ndfc.c
@@ -140,18 +140,6 @@ static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 		out_be32(ndfc->ndfcbase + NDFC_DATA, *p++);
 }
 
-static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
-{
-	struct nand_chip *chip = mtd->priv;
-	struct ndfc_controller *ndfc = chip->priv;
-	uint32_t *p = (uint32_t *) buf;
-
-	for(;len > 0; len -= 4)
-		if (*p++ != in_be32(ndfc->ndfcbase + NDFC_DATA))
-			return -EFAULT;
-	return 0;
-}
-
 /*
  * Initialize chip structure
  */
@@ -172,7 +160,6 @@ static int ndfc_chip_init(struct ndfc_controller *ndfc,
 	chip->controller = &ndfc->ndfc_control;
 	chip->read_buf = ndfc_read_buf;
 	chip->write_buf = ndfc_write_buf;
-	chip->verify_buf = ndfc_verify_buf;
 	chip->ecc.correct = nand_correct_data;
 	chip->ecc.hwctl = ndfc_enable_hwecc;
 	chip->ecc.calculate = ndfc_calculate_ecc;