linux-kernel - Re: [PATCH] mmc: sunxi-mmc: Fix clock refcount imbalance during unbind

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Date:   Mon, 15 Aug 2022 12:11:20 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Andre Przywara <andre.przywara@....com>,
        Maxime Ripard <maxime@...no.tech>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] mmc: sunxi-mmc: Fix clock refcount imbalance during unbind

On Wed, 10 Aug 2022 at 04:25, Samuel Holland <samuel@...lland.org> wrote:
>
> If the controller is suspended by runtime PM, the clock is already
> disabled, so do not try to disable it again during removal. Use
> pm_runtime_disable() to flush any pending runtime PM transitions.
>
> Fixes: 9a8e1e8cc2c0 ("mmc: sunxi: Add runtime_pm support")
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>
>  drivers/mmc/host/sunxi-mmc.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index b16e12e62e72..3db9f32d6a7b 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -1492,9 +1492,11 @@ static int sunxi_mmc_remove(struct platform_device *pdev)
>         struct sunxi_mmc_host *host = mmc_priv(mmc);
>
>         mmc_remove_host(mmc);
> -       pm_runtime_force_suspend(&pdev->dev);
> -       disable_irq(host->irq);
> -       sunxi_mmc_disable(host);

Perhaps a better option than the below, would just be to drop the
above calls to disable_irq() and sunxi_mmc_disable(), as that is
already managed through the call to pm_runtime_force_suspend().

> +       pm_runtime_disable(&pdev->dev);
> +       if (!pm_runtime_status_suspended(&pdev->dev)) {
> +               disable_irq(host->irq);
> +               sunxi_mmc_disable(host);
> +       }
>         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
>         mmc_free_host(mmc);
>

Kind regards
Uffe