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

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Message-ID: <CAPDyKFpiuWY+vC1cY8xLozFucsTA0vMHVk_KTpzCfOcXntcBZg@mail.gmail.com>
Date:   Mon, 2 Jan 2023 16:07:21 +0100
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 Sun, 1 Jan 2023 at 20:25, Samuel Holland <samuel@...lland.org> wrote:
>
> On 8/15/22 05:11, Ulf Hansson wrote:
> > 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().
>
> I like the idea, but it will not work for !CONFIG_PM builds, which this
> driver currently supports.

Good point! I have applied the patch for fixes and added a stable tag
to it, thanks!

[...]

Kind regards
Uffe