linux-kernel - Re: [PATCH v2 06/14] mmc: dw_mmc: simplify optional reset handling

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Date:   Thu, 16 Mar 2017 15:46:53 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/14] mmc: dw_mmc: simplify optional reset handling

On 15 March 2017 at 12:31, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> As of commit bb475230b8e5 ("reset: make optional functions really
> optional"), the reset framework API calls use NULL pointers to describe
> optional, non-present reset controls.
>
> This allows to return errors from devm_reset_control_get_optional and to
> call reset_control_(de)assert unconditionally.
>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>

Thanks, applied for next!

Kind regards
Uffe

> ---
>  drivers/mmc/host/dw_mmc.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index a9ac0b4573131..3d62b0a1f81cb 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2968,10 +2968,8 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>
>         /* find reset controller when exist */
>         pdata->rstc = devm_reset_control_get_optional(dev, "reset");
> -       if (IS_ERR(pdata->rstc)) {
> -               if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
> -                       return ERR_PTR(-EPROBE_DEFER);
> -       }
> +       if (IS_ERR(pdata->rstc))
> +               return ERR_CAST(pdata->rstc);
>
>         /* find out number of slots supported */
>         of_property_read_u32(np, "num-slots", &pdata->num_slots);
> @@ -3100,7 +3098,7 @@ int dw_mci_probe(struct dw_mci *host)
>                 }
>         }
>
> -       if (!IS_ERR(host->pdata->rstc)) {
> +       if (host->pdata->rstc) {
>                 reset_control_assert(host->pdata->rstc);
>                 usleep_range(10, 50);
>                 reset_control_deassert(host->pdata->rstc);
> @@ -3257,8 +3255,7 @@ int dw_mci_probe(struct dw_mci *host)
>         if (host->use_dma && host->dma_ops->exit)
>                 host->dma_ops->exit(host);
>
> -       if (!IS_ERR(host->pdata->rstc))
> -               reset_control_assert(host->pdata->rstc);
> +       reset_control_assert(host->pdata->rstc);
>
>  err_clk_ciu:
>         clk_disable_unprepare(host->ciu_clk);
> @@ -3290,8 +3287,7 @@ void dw_mci_remove(struct dw_mci *host)
>         if (host->use_dma && host->dma_ops->exit)
>                 host->dma_ops->exit(host);
>
> -       if (!IS_ERR(host->pdata->rstc))
> -               reset_control_assert(host->pdata->rstc);
> +       reset_control_assert(host->pdata->rstc);
>
>         clk_disable_unprepare(host->ciu_clk);
>         clk_disable_unprepare(host->biu_clk);
> --
> 2.11.0
>