linux-kernel - Re: [PATCH] mmc: block: Let CMD13 polling only for MMC IOCTLS with the R1B response

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Date:   Fri, 4 Dec 2020 15:38:20 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Bean Huo <huobean@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "(Exiting) Baolin Wang" <baolin.wang@...aro.org>,
        "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Arnd Bergmann <arnd@...db.de>,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        彭浩(Richard) <richard.peng@...o.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Avri Altman <avri.altman@....com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        zliua@...ron.com,
        "Zoltan Szubbocsev (zszubbocsev)" <zszubbocsev@...ron.com>,
        "# 4.0+" <stable@...r.kernel.org>
Subject: Re: [PATCH] mmc: block: Let CMD13 polling only for MMC IOCTLS with
 the R1B response

On Wed, 2 Dec 2020 at 21:23, Bean Huo <huobean@...il.com> wrote:
>
> From: Bean Huo <beanhuo@...ron.com>
>
> The CMD13 polling is only needed for the command with R1B Resp. For the
> command with R1 Resp, such as open-ended multiple block read/write
> (CMD18/25) commands, the device will just wait for its next paired command.
> There is no need to poll device status through CMD13.
>
> Meanwhile, based on the original change commit (mmc: block: Add CMD13 polling
> for MMC IOCTLS with R1B response), and comment in __mmc_blk_ioctl_cmd(),
> current code is not in line with its original purpose. So fix it with this patch.
>
> Fixes: a0d4c7eb71dd ("mmc: block: Add CMD13 polling for MMC IOCTLS with R1B response")
> Cc: stable@...r.kernel.org
> Reported-by: Zhan Liu <zliua@...ron.com>
> Signed-off-by: Zhan Liu <zliua@...ron.com>
> Signed-off-by: Bean Huo <beanhuo@...ron.com>

Applied for fixes, thanks!

Note, I took the liberty to rephrase the commit message (and the
header) to clarify things a bit more.

Kind regards
Uffe


> ---
>  drivers/mmc/core/block.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 8d3df0be0355..42e27a298218 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -580,7 +580,7 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
>
>         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
>
> -       if (idata->rpmb || (cmd.flags & MMC_RSP_R1B)) {
> +       if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
>                 /*
>                  * Ensure RPMB/R1B command has completed by polling CMD13
>                  * "Send Status".
> --
> 2.17.1
>