linux-kernel - Re: [PATCH] mmc: sdhci: Convert sdhci_allocate_bounce

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Message-ID: <CAPDyKFp8vo11pb-5qVdhkxTgMnL-R0FvYKuh_dkLDNbF6_4=XQ@mail.gmail.com>
Date:   Wed, 24 Oct 2018 15:50:02 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH] mmc: sdhci: Convert sdhci_allocate_bounce_buffer() to
 return void

On 24 October 2018 at 10:01, Chunyan Zhang <zhang.chunyan@...aro.org> wrote:
> The function sdhci_allocate_bounce_buffer() always return zero at
> present, so there's no need to have a return value, that will also make
> error path easier.
>
> CC: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>

This looks good to me, however please re-post to linux-mmc.

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 1b3fbd9..e94f4aa 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3408,7 +3408,7 @@ void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
>  }
>  EXPORT_SYMBOL_GPL(__sdhci_read_caps);
>
> -static int sdhci_allocate_bounce_buffer(struct sdhci_host *host)
> +static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
>  {
>         struct mmc_host *mmc = host->mmc;
>         unsigned int max_blocks;
> @@ -3446,7 +3446,7 @@ static int sdhci_allocate_bounce_buffer(struct sdhci_host *host)
>                  * Exiting with zero here makes sure we proceed with
>                  * mmc->max_segs == 1.
>                  */
> -               return 0;
> +               return;
>         }
>
>         host->bounce_addr = dma_map_single(mmc->parent,
> @@ -3456,7 +3456,7 @@ static int sdhci_allocate_bounce_buffer(struct sdhci_host *host)
>         ret = dma_mapping_error(mmc->parent, host->bounce_addr);
>         if (ret)
>                 /* Again fall back to max_segs == 1 */
> -               return 0;
> +               return;
>         host->bounce_buffer_size = bounce_size;
>
>         /* Lie about this since we're bouncing */
> @@ -3466,8 +3466,6 @@ static int sdhci_allocate_bounce_buffer(struct sdhci_host *host)
>
>         pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
>                 mmc_hostname(mmc), max_blocks, bounce_size);
> -
> -       return 0;
>  }
>
>  int sdhci_setup_host(struct sdhci_host *host)
> @@ -3987,12 +3985,9 @@ int sdhci_setup_host(struct sdhci_host *host)
>          */
>         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
>
> -       if (mmc->max_segs == 1) {
> +       if (mmc->max_segs == 1)
>                 /* This may alter mmc->*_blk_* parameters */
> -               ret = sdhci_allocate_bounce_buffer(host);
> -               if (ret)
> -                       return ret;
> -       }
> +               sdhci_allocate_bounce_buffer(host);
>
>         return 0;
>
> --
> 2.7.4
>