linux-kernel - Re: [PATCH v4 1/3] mmc: core: Remove some redundant validations in mmc

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Message-ID: <CAPDyKFotQk5XYU1WkTJruWfrRy=Td2ARNdbSj5-2fQBOx9dUsg@mail.gmail.com>
Date:   Tue, 6 Sep 2016 14:17:43 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Doug Anderson <dianders@...omium.org>,
        Heiko Stübner <heiko@...ech.de>,
        David Jander <david@...tonic.nl>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 1/3] mmc: core: Remove some redundant validations in
 mmc_erase() function

On 6 September 2016 at 04:55, Baolin Wang <baolin.wang@...aro.org> wrote:
> Before issuing mmc_erase() function, users always have checked if it can
> erase with mmc_can_erase/trim/discard() function, thus remove the redundant
> erase checking in mmc_erase() function.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> Tested-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> Changes since v3:
>  - Split into 3 separate patches.
>  - Add test tag by Shawn.
>
> Changes since v2:
>  - Add nr checking and other optimization in mmc_erase() function.
>
> Changes since v1:
>  - Add the alignment if card->erase_size is not power of 2.
> ---
>  drivers/mmc/core/core.c |    7 -------
>  1 file changed, 7 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index e55cde6..7d7209d 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2217,13 +2217,6 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
>         unsigned int rem, to = from + nr;
>         int err;
>
> -       if (!(card->host->caps & MMC_CAP_ERASE) ||
> -           !(card->csd.cmdclass & CCC_ERASE))
> -               return -EOPNOTSUPP;
> -
> -       if (!card->erase_size)
> -               return -EOPNOTSUPP;
> -

Could we postpone this until after a clean-up-series of the mmc erase functions?

Until the function remains an exported API, I think it should keep
doing this validations.

>         if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
>                 return -EOPNOTSUPP;
>
> --
> 1.7.9.5
>

Kind regards
Uffe