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References: <20210414100010.3877669-1-narmstrong@baylibre.com>
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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Thu, 15 Apr 2021 11:07:03 +0200
Message-ID: <CAPDyKFpNLu3R+7ODZaC7yWMYbSOujswgLTkN97FQNg5zhwSxgw@mail.gmail.com>
Subject: Re: [PATCH] mmc: meson-gx: remove useless warning about scatterlist
 size alignment in block mode
To:     Neil Armstrong <narmstrong@baylibre.com>
Cc:     linux-mmc <linux-mmc@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Dmitry Lebed <lebed.dmitry@gmail.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>
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On Wed, 14 Apr 2021 at 12:00, Neil Armstrong <narmstrong@baylibre.com> wrote:
>
> Since commit e085b51c74cc ("mmc: meson-gx: check for scatterlist size alignment in block mode"),
> support for SDIO SD_IO_RW_EXTENDED transferts are properly filtered but some driver
> like brcmfmac still gives a block sg buffer size not aligned with SDIO block,
> triggerring a warning even if the transfer works in degraded mode.
>
> This should be ultimately fixed in brcmfmac, but since it's only a performance issue
> the warning should be removed.
>
> Fixes: e085b51c74cc ("mmc: meson-gx: check for scatterlist size alignment in block mode")
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index eb6c02bc4a02..6bc151045843 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -246,11 +246,8 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
>                  * size, otherwise chain mode could not be used.
>                  */
>                 for_each_sg(data->sg, sg, data->sg_len, i) {
> -                       if (sg->length % data->blksz) {
> -                               WARN_ONCE(1, "unaligned sg len %u blksize %u\n",
> -                                         sg->length, data->blksz);

Rather than removing this warning, perhaps an option could be to use
dev_warn_once() instead?

> +                       if (sg->length % data->blksz)
>                                 return;
> -                       }
>                 }
>         }
>

Kind regards
Uffe