On Tue, Sep 06, 2016 at 10:55:11AM +0800, Baolin Wang wrote:
> 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@xxxxxxxxxx>
> Tested-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 60 +++++++++++++++++++++++++++++------------------
> 1 file changed, 37 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 7d7209d..5f93eef 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2202,6 +2202,37 @@ 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;
> +
> + /* 'from' and 'to' are inclusive */
> + *to = from_new + nr_new - 1;
> + *from = from_new;
> +
> + return nr_new;
> +}
> +
> /**
> * mmc_erase - erase sectors.
> * @card: card to erase
> @@ -2234,31 +2265,14 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
> }
>
> 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;
> + nr = mmc_align_erase_size(card, &from, &to, nr);
> + if (nr == 0)
> + return 0;
> + } else {
> + /* 'from' and 'to' are inclusive */
> + to -= 1;
> }
>
> - if (nr == 0)
> - return 0;
> -
> - to = from + nr;
> -
> - if (to <= from)
> - return -EINVAL;
Hmm, this is swallowing -EINVAL behaviour
i.e., now possibly violating protocol?
(this may easily be ok - haven't done an extensive review -
but since the commit has that characteristic change,
the commit message should contain that detail)
Thanks for the cleanup work & HTH,
Andreas Mohr
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