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[MTD] NAND: Fix broken bad block table scan

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Make the bad block table search functional again

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2005-06-14 16:39:57 +01:00 • committed by Thomas Gleixner
parent bfabb98688
commit c9e0536523
1 changed files with 43 additions and 10 deletions
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53
drivers/mtd/nand/nand_bbt.c
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@ -6,7 +6,7 @@
* *
* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
* *
* $Id: nand_bbt.c,v 1.31 2005/02/16 17:09:36 dedekind Exp $ * $Id: nand_bbt.c,v 1.33 2005/06/14 15:47:56 gleixner Exp $
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as * it under the terms of the GNU General Public License version 2 as
@ -80,14 +80,14 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
int i, end = 0; int i, end = 0;
uint8_t *p = buf; uint8_t *p = buf;
end = paglen + td->offs;
if (td->options & NAND_BBT_SCANEMPTY) { if (td->options & NAND_BBT_SCANEMPTY) {
end = paglen + td->offs;
for (i = 0; i < end; i++) { for (i = 0; i < end; i++) {
if (p[i] != 0xff) if (p[i] != 0xff)
return -1; return -1;
} }
p += end;
} }
p += end;
/* Compare the pattern */ /* Compare the pattern */
for (i = 0; i < td->len; i++) { for (i = 0; i < td->len; i++) {
@ -106,6 +106,32 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des
return 0; return 0;
} }
/**
* check_short_pattern - [GENERIC] check if a pattern is in the buffer
* @buf: the buffer to search
* @len: the length of buffer to search
* @paglen: the pagelength
* @td: search pattern descriptor
*
* Check for a pattern at the given place. Used to search bad block
* tables and good / bad block identifiers. Same as check_pattern, but
* no optional empty check and the pattern is expected to start
* at offset 0.
*
*/
static int check_short_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td)
{
int i;
uint8_t *p = buf;
/* Compare the pattern */
for (i = 0; i < td->len; i++) {
if (p[i] != td->pattern[i])
return -1;
}
return 0;
}
/** /**
* read_bbt - [GENERIC] Read the bad block table starting from page * read_bbt - [GENERIC] Read the bad block table starting from page
* @mtd: MTD device structure * @mtd: MTD device structure
@ -316,18 +342,25 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
readlen, &retlen, &buf[0]); readlen, &retlen, &buf[0]);
if (ret) if (ret)
return ret; return ret;
}
if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { if (check_short_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
this->bbt[i >> 3] |= 0x03 << (i & 0x6); this->bbt[i >> 3] |= 0x03 << (i & 0x6);
printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
i >> 1, (unsigned int) from); i >> 1, (unsigned int) from);
break; break;
}
} else {
if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
this->bbt[i >> 3] |= 0x03 << (i & 0x6);
printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n",
i >> 1, (unsigned int) from);
break;
}
} }
} }
i += 2; i += 2;
from += (1 << this->bbt_erase_shift); from += (1 << this->bbt_erase_shift);
} }
return 0; return 0;
} }