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UBI: separate bad_peb_limit in a function

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No functional changes here, just to prepare for next patch.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Richard Genoud 2012-08-17 16:35:18 +02:00 • committed by Artem Bityutskiy
parent 60a387dc5e
commit 95e6fb027e
1 changed files with 31 additions and 23 deletions
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54
drivers/mtd/ubi/build.c
View file

@ -565,6 +565,34 @@ void ubi_free_internal_volumes(struct ubi_device *ubi)
} }
} }
static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
{
int limit, device_pebs;
uint64_t device_size;
if (!max_beb_per1024)
return 0;
/*
* Here we are using size of the entire flash chip and
* not just the MTD partition size because the maximum
* number of bad eraseblocks is a percentage of the
* whole device and bad eraseblocks are not fairly
* distributed over the flash chip. So the worst case
* is that all the bad eraseblocks of the chip are in
* the MTD partition we are attaching (ubi->mtd).
*/
device_size = mtd_get_device_size(ubi->mtd);
device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
limit = mult_frac(device_pebs, max_beb_per1024, 1024);
/* Round it up */
if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs)
limit += 1;
return limit;
}
/** /**
* io_init - initialize I/O sub-system for a given UBI device. * io_init - initialize I/O sub-system for a given UBI device.
* @ubi: UBI device description object * @ubi: UBI device description object
@ -582,6 +610,8 @@ void ubi_free_internal_volumes(struct ubi_device *ubi)
*/ */
static int io_init(struct ubi_device *ubi) static int io_init(struct ubi_device *ubi)
{ {
const int max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
if (ubi->mtd->numeraseregions != 0) { if (ubi->mtd->numeraseregions != 0) {
/* /*
* Some flashes have several erase regions. Different regions * Some flashes have several erase regions. Different regions
@ -610,29 +640,7 @@ static int io_init(struct ubi_device *ubi)
if (mtd_can_have_bb(ubi->mtd)) { if (mtd_can_have_bb(ubi->mtd)) {
ubi->bad_allowed = 1; ubi->bad_allowed = 1;
if (CONFIG_MTD_UBI_BEB_LIMIT > 0) { ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024);
int per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
int limit, device_pebs;
uint64_t device_size;
/*
* Here we are using size of the entire flash chip and
* not just the MTD partition size because the maximum
* number of bad eraseblocks is a percentage of the
* whole device and bad eraseblocks are not fairly
* distributed over the flash chip. So the worst case
* is that all the bad eraseblocks of the chip are in
* the MTD partition we are attaching (ubi->mtd).
*/
device_size = mtd_get_device_size(ubi->mtd);
device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
limit = mult_frac(device_pebs, per1024, 1024);
/* Round it up */
if (mult_frac(limit, 1024, per1024) < device_pebs)
limit += 1;
ubi->bad_peb_limit = limit;
}
} }
if (ubi->mtd->type == MTD_NORFLASH) { if (ubi->mtd->type == MTD_NORFLASH) {