Commit dad22562 authored by Brian Norris's avatar Brian Norris Committed by David Woodhouse
Browse files

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: default avatarBrian Norris <computersforpeace@gmail.com>
Cc: Ivan Djelic <ivan.djelic@parrot.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent b32843b7

Documentation/DocBook/mtdnand.tmpl

+0 −2
Original line number Original line Diff line number Diff line
@@ -1224,8 +1224,6 @@ in this page</entry> 
#define NAND_BBT_CREATE		0x00000200

#define NAND_BBT_CREATE		0x00000200

/* Search good / bad pattern through all pages of a block */

/* Search good / bad pattern through all pages of a block */

#define NAND_BBT_SCANALLPAGES	0x00000400

#define NAND_BBT_SCANALLPAGES	0x00000400

/* Scan block empty during good / bad block scan */

#define NAND_BBT_SCANEMPTY	0x00000800

/* Write bbt if neccecary */

/* Write bbt if neccecary */

#define NAND_BBT_WRITE		0x00001000

#define NAND_BBT_WRITE		0x00001000

/* Read and write back block contents when writing bbt */

/* Read and write back block contents when writing bbt */

drivers/mtd/nand/nand_bbt.c

+5 −28
Original line number Original line Diff line number Diff line
@@ -110,33 +110,17 @@ static int check_pattern_no_oob(uint8_t *buf, struct nand_bbt_descr *td) 
 * @td: search pattern descriptor

 * @td: search pattern descriptor

 *

 *

 * Check for a pattern at the given place. Used to search bad block tables and

 * 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

 * good / bad block identifiers.

 * all bytes except the pattern area contain 0xff.

 */

 */

static int check_pattern(uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)

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)

	if (td->options & NAND_BBT_NO_OOB)

		return check_pattern_no_oob(buf, td);

		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 */

	/* Compare the pattern */

	if (memcmp(p, td->pattern, td->len))

	if (memcmp(buf + paglen + td->offs, td->pattern, td->len))

		return -1;

		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;

	return 0;

}

}
@@ -507,15 +491,9 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, 
	else

	else

		numpages = 1;

		numpages = 1;





	if (!(bd->options & NAND_BBT_SCANEMPTY)) {

	/* We need only read few bytes from the OOB area */

	/* We need only read few bytes from the OOB area */

	scanlen = 0;

	scanlen = 0;

	readlen = bd->len;

	readlen = bd->len;

	} else {

		/* Full page content should be read */

		scanlen = mtd->writesize + mtd->oobsize;

		readlen = numpages * mtd->writesize;

	}





	if (chip == -1) {

	if (chip == -1) {

		numblocks = mtd->size >> this->bbt_erase_shift;

		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;

	struct nand_chip *this = mtd->priv;





	bd->options &= ~NAND_BBT_SCANEMPTY;

	return create_bbt(mtd, this->buffers->databuf, bd, -1);

	return create_bbt(mtd, this->buffers->databuf, bd, -1);

}

}

drivers/mtd/nand/omap2.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -154,7 +154,7 @@ static struct nand_ecclayout omap_oobinfo; 
 */

 */

static uint8_t scan_ff_pattern[] = { 0xff };

static uint8_t scan_ff_pattern[] = { 0xff };

static struct nand_bbt_descr bb_descrip_flashbased = {

static struct nand_bbt_descr bb_descrip_flashbased = {

	.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,

	.options = NAND_BBT_SCANALLPAGES,

	.offs = 0,

	.offs = 0,

	.len = 1,

	.len = 1,

	.pattern = scan_ff_pattern,

	.pattern = scan_ff_pattern,

drivers/mtd/onenand/onenand_bbt.c

+0 −1
Original line number Original line Diff line number Diff line
@@ -133,7 +133,6 @@ static inline int onenand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_desc 
{

{

	struct onenand_chip *this = mtd->priv;

	struct onenand_chip *this = mtd->priv;





        bd->options &= ~NAND_BBT_SCANEMPTY;

	return create_bbt(mtd, this->page_buf, bd, -1);

	return create_bbt(mtd, this->page_buf, bd, -1);

}

}

include/linux/mtd/bbm.h

+0 −2
Original line number Original line Diff line number Diff line
@@ -93,8 +93,6 @@ struct nand_bbt_descr { 
#define NAND_BBT_CREATE_EMPTY	0x00000400

#define NAND_BBT_CREATE_EMPTY	0x00000400

/* Search good / bad pattern through all pages of a block */

/* Search good / bad pattern through all pages of a block */

#define NAND_BBT_SCANALLPAGES	0x00000800

#define NAND_BBT_SCANALLPAGES	0x00000800

/* Scan block empty during good / bad block scan */

#define NAND_BBT_SCANEMPTY	0x00001000

/* Write bbt if neccecary */

/* Write bbt if neccecary */

#define NAND_BBT_WRITE		0x00002000

#define NAND_BBT_WRITE		0x00002000

/* Read and write back block contents when writing bbt */

/* Read and write back block contents when writing bbt */

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