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mmc: core: Factor out the alignment of erase size 

In order to clean up the mmc_erase() function and do some optimization
for erase size alignment, factor out the guts of erase size alignment
into mmc_align_erase_size() function.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Tested-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Baolin Wang 2016-09-07 10:38:24 +08:00 committed by Ulf Hansson
parent 902a8a0b50
commit 71085123d2
1 changed files with 32 additions and 16 deletions
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48
drivers/mmc/core/core.c
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@ -2205,6 +2205,36 @@ out:
return err;
}
static unsigned int mmc_align_erase_size(struct mmc_card *card,
unsigned int *from,
unsigned int *to,
unsigned int nr)
{
unsigned int from_new = *from, nr_new = nr, rem;
rem = from_new % card->erase_size;
if (rem) {
rem = card->erase_size - rem;
from_new += rem;
if (nr_new > rem)
nr_new -= rem;
else
return 0;
}
rem = nr_new % card->erase_size;
if (rem)
nr_new -= rem;
if (nr_new == 0)
return 0;
*to = from_new + nr_new;
*from = from_new;
return nr_new;
}
/**
* mmc_erase - erase sectors.
* @card: card to erase
@ -2243,26 +2273,12 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
return -EINVAL;
}
if (arg == MMC_ERASE_ARG) {
rem = from % card->erase_size;
if (rem) {
rem = card->erase_size - rem;
from += rem;
if (nr > rem)
nr -= rem;
else
return 0;
}
rem = nr % card->erase_size;
if (rem)
nr -= rem;
}
if (arg == MMC_ERASE_ARG)
nr = mmc_align_erase_size(card, &from, &to, nr);
if (nr == 0)
return 0;
to = from + nr;
if (to <= from)
return -EINVAL;