linux-kernel - Re: [PATCH v2] mmc: meson-gx: fix error path when driver initialization fails before enabling clocks

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Message-ID: <CAPDyKFpML0_0Q36j7GqZJvY4r1ZnGaVcs8HgEAqUeC_tki0G_A@mail.gmail.com>
Date:   Thu, 16 Mar 2017 15:46:42 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Michał Zegan <webczat@...czatnet.pl>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-amlogic@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: meson-gx: fix error path when driver
 initialization fails before enabling clocks

On 14 March 2017 at 21:05, Michał Zegan <webczat@...czatnet.pl> wrote:
> This patch fixes the case where meson_mmc_probe function fails before
> core_clk is enabled.
> Originally, that would result in a try to disable the core clock, and if
> it was not already enabled, it would result in a kernel warning.
> This issue is similar to the one with div_clk.
> Fix it by introducing another error path used only between successfully
> enabling the core clock, and successfully enabling the div clock.
> That would ensure that core clock is disabled only if it was enabled before.
>
> Signed-off-by: Michał Zegan <webczat@...czatnet.pl>

Thanks, applied for next!

Kind regards
Uffe

> ---
> changes since v1:
> cherry picked on top of mmc next branch
>  drivers/mmc/host/meson-gx-mmc.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index c574e1519623..bd075fef08d4 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -743,7 +743,7 @@ static int meson_mmc_probe(struct platform_device *pdev)
>
>         ret = meson_mmc_clk_init(host);
>         if (ret)
> -               goto free_host;
> +               goto err_core_clk;
>
>         /* Stop execution */
>         writel(0, host->regs + SD_EMMC_START);
> @@ -783,8 +783,9 @@ static int meson_mmc_probe(struct platform_device *pdev)
>
>  err_div_clk:
>         clk_disable_unprepare(host->cfg_div_clk);
> -free_host:
> +err_core_clk:
>         clk_disable_unprepare(host->core_clk);
> +free_host:
>         mmc_free_host(mmc);
>         return ret;
>  }
> --
> 2.12.0
>