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, 16 deletions

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index cf0cd3146817..21e64b5d352b 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -447,8 +447,6 @@ static unsigned int rptwear_cnt = 0;
 /* MTD structure for NAND controller */
 static struct mtd_info *nsmtd;
 
-static u_char ns_verify_buf[NS_LARGEST_PAGE_SIZE];
-
 /*
  * Allocate array of page pointers, create slab allocation for an array
  * and initialize the array by NULL pointers.
@@ -2189,19 +2187,6 @@ static void ns_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
         return;
 }
 
-static int ns_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
-{
-        ns_nand_read_buf(mtd, (u_char *)&ns_verify_buf[0], len);
-
-        if (!memcmp(buf, &ns_verify_buf[0], len)) {
-                NS_DBG("verify_buf: the buffer is OK\n");
-                return 0;
-        } else {
-                NS_DBG("verify_buf: the buffer is wrong\n");
-                return -EFAULT;
-        }
-}
-
 /*
  * Module initialization function
  */
@@ -2236,7 +2221,6 @@ static int __init ns_init_module(void)
         chip->dev_ready  = ns_device_ready;
         chip->write_buf  = ns_nand_write_buf;
         chip->read_buf   = ns_nand_read_buf;
-        chip->verify_buf = ns_nand_verify_buf;
         chip->read_word  = ns_nand_read_word;
         chip->ecc.mode   = NAND_ECC_SOFT;
         /* The NAND_SKIP_BBTSCAN option is necessary for 'overridesize' */