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mtd: nand: remove NAND_BBT_SCANEMPTY 

NAND_BBT_SCANEMPTY is a strange, badly-supported option with omap as its
single remaining user.

NAND_BBT_SCANEMPTY was likely used by accident in omap2[1]. And anyway,
omap2 doesn't scan the chip for bad blocks (courtesy of
NAND_SKIP_BBTSCAN), and so its use of this option is irrelevant.

This patch drops the NAND_BBT_SCANEMPTY option.

[1] http://lists.infradead.org/pipermail/linux-mtd/2012-July/042902.html

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Ivan Djelic <ivan.djelic@parrot.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Brian Norris 2013-07-30 17:53:00 -07:00 committed by David Woodhouse
parent b32843b772
commit dad2256269
5 changed files with 6 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/DocBook/mtdnand.tmpl
View File

@ -1224,8 +1224,6 @@ in this page</entry>
#define NAND_BBT_CREATE 0x00000200
/* Search good / bad pattern through all pages of a block */
#define NAND_BBT_SCANALLPAGES 0x00000400
/* Scan block empty during good / bad block scan */
#define NAND_BBT_SCANEMPTY 0x00000800
/* Write bbt if neccecary */
#define NAND_BBT_WRITE 0x00001000
/* Read and write back block contents when writing bbt */

33
drivers/mtd/nand/nand_bbt.c
View File

@ -110,33 +110,17 @@ static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td)
* @td: search pattern descriptor
*
* Check for a pattern at the given place. Used to search bad block tables and
* good / bad block identifiers. If the SCAN_EMPTY option is set then check, if
* all bytes except the pattern area contain 0xff.
* good / bad block identifiers.
*/
static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
{
int end = 0;
uint8_t *p = buf;
if (td->options & NAND_BBT_NO_OOB)
return check_pattern_no_oob(buf, td);
end = paglen + td->offs;
if (td->options & NAND_BBT_SCANEMPTY)
if (memchr_inv(p, 0xff, end))
return -1;
p += end;
/* Compare the pattern */
if (memcmp(p, td->pattern, td->len))
if (memcmp(buf + paglen + td->offs, td->pattern, td->len))
return -1;
if (td->options & NAND_BBT_SCANEMPTY) {
p += td->len;
end += td->len;
if (memchr_inv(p, 0xff, len - end))
return -1;
}
return 0;
}
@ -507,15 +491,9 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf,
else
numpages = 1;
if (!(bd->options & NAND_BBT_SCANEMPTY)) {
/* We need only read few bytes from the OOB area */
scanlen = 0;
readlen = bd->len;
} else {
/* Full page content should be read */
scanlen = mtd->writesize + mtd->oobsize;
readlen = numpages * mtd->writesize;
}
/* We need only read few bytes from the OOB area */
scanlen = 0;
readlen = bd->len;
if (chip == -1) {
numblocks = mtd->size >> this->bbt_erase_shift;
@ -882,7 +860,6 @@ static inline int nand_memory_bbt(struct mtd_info *mtd, struct nand_bbt_descr *b
{
struct nand_chip *this = mtd->priv;
bd->options &= ~NAND_BBT_SCANEMPTY;
return create_bbt(mtd, this->buffers->databuf, bd, -1);
}

2
drivers/mtd/nand/omap2.c
View File

@ -154,7 +154,7 @@ static struct nand_ecclayout omap_oobinfo;
*/
static uint8_t scan_ff_pattern[] = { 0xff };
static struct nand_bbt_descr bb_descrip_flashbased = {
.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
.options = NAND_BBT_SCANALLPAGES,
.offs = 0,
.len = 1,
.pattern = scan_ff_pattern,

1
drivers/mtd/onenand/onenand_bbt.c
View File

@ -133,7 +133,6 @@ static inline int onenand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_desc
{
struct onenand_chip *this = mtd->priv;
bd->options &= ~NAND_BBT_SCANEMPTY;
return create_bbt(mtd, this->page_buf, bd, -1);
}

2
include/linux/mtd/bbm.h
View File

@ -93,8 +93,6 @@ struct nand_bbt_descr {
#define NAND_BBT_CREATE_EMPTY 0x00000400
/* Search good / bad pattern through all pages of a block */
#define NAND_BBT_SCANALLPAGES 0x00000800
/* Scan block empty during good / bad block scan */
#define NAND_BBT_SCANEMPTY 0x00001000
/* Write bbt if neccecary */
#define NAND_BBT_WRITE 0x00002000
/* Read and write back block contents when writing bbt */