Commit 71085123 authored by Baolin Wang's avatar Baolin Wang Committed by Ulf Hansson
Browse files

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: default avatarBaolin Wang <baolin.wang@linaro.org>
Tested-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 902a8a0b

drivers/mmc/core/core.c

+32 −16
Original line number Diff line number Diff line
@@ -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;

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