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, 3 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index eeb70153b646..1d90e4f82bcf 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -394,8 +394,6 @@ struct nand_buffers {
  * @read_word:          [REPLACEABLE] read one word from the chip
  * @write_buf:          [REPLACEABLE] write data from the buffer to the chip
  * @read_buf:           [REPLACEABLE] read data from the chip into the buffer
- * @verify_buf:         [REPLACEABLE] verify buffer contents against the chip
- *                      data.
  * @select_chip:        [REPLACEABLE] select chip nr
  * @block_bad:          [REPLACEABLE] check, if the block is bad
  * @block_markbad:      [REPLACEABLE] mark the block bad
@@ -478,7 +476,6 @@ struct nand_chip {
         u16 (*read_word)(struct mtd_info *mtd);
         void (*write_buf)(struct mtd_info *mtd, const uint8_t *buf, int len);
         void (*read_buf)(struct mtd_info *mtd, uint8_t *buf, int len);
-        int (*verify_buf)(struct mtd_info *mtd, const uint8_t *buf, int len);
         void (*select_chip)(struct mtd_info *mtd, int chip);
         int (*block_bad)(struct mtd_info *mtd, loff_t ofs, int getchip);
         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);