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CFI: fix eraseregions numblocks 

eraseregions numblocks was sometimes one less than actual, possibly producing
erase regions with zero blocks. As MTD code touches eraseregions only if
numeraseregions is greater that zero, allocate eraseregions only for non
uniform erase size flash.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Ladislav Michl 2010-01-28 12:27:14 +01:00 committed by Stefan Roese
parent 9b208ece0a
commit f3dec798d9
1 changed files with 18 additions and 17 deletions
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35
drivers/mtd/cfi_mtd.c
View File

@ -161,8 +161,8 @@ static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
int sect;
int regions = 0;
int numblocks = 0;
ulong offset = 0;
ulong base_addr = fi->start[0];
ulong offset;
ulong base_addr;
/*
* First detect the number of eraseregions so that we can allocate
@ -174,29 +174,35 @@ static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
sect_size_old = flash_sector_size(fi, sect);
}
switch (regions) {
case 0:
return 1;
case 1: /* flash has uniform erase size */
mtd->numeraseregions = 0;
mtd->erasesize = sect_size_old;
return 0;
}
mtd->numeraseregions = regions;
mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info) * regions);
/*
* Now detect the largest sector and fill the eraseregions
*/
sect_size_old = 0;
regions = 0;
base_addr = offset = fi->start[0];
sect_size_old = flash_sector_size(fi, 0);
for (sect = 0; sect < fi->sector_count; sect++) {
if ((sect_size_old != flash_sector_size(fi, sect)) &&
(sect_size_old != 0)) {
if (sect_size_old != flash_sector_size(fi, sect)) {
mtd->eraseregions[regions].offset = offset - base_addr;
mtd->eraseregions[regions].erasesize = sect_size_old;
mtd->eraseregions[regions].numblocks = numblocks;
/* Now start counting the next eraseregions */
numblocks = 0;
regions++;
} else {
numblocks++;
}
if (sect_size_old != flash_sector_size(fi, sect))
offset = fi->start[sect];
}
numblocks++;
/*
* Select the largest sector size as erasesize (e.g. for UBI)
@ -212,12 +218,7 @@ static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi)
*/
mtd->eraseregions[regions].offset = offset - base_addr;
mtd->eraseregions[regions].erasesize = sect_size_old;
mtd->eraseregions[regions].numblocks = numblocks + 1;
if (regions)
mtd->numeraseregions = regions + 1;
else
mtd->numeraseregions = 0;
mtd->eraseregions[regions].numblocks = numblocks;
mtd->erasesize = sect_size;