linux-kernel - Re: [PATCH] mmc: sdhci-msm: pervent access to suspended controller

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Date: Tue, 2 Apr 2024 12:56:50 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Mantas Pucka <mantas@...vices.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Ritesh Harjani <riteshh@...eaurora.org>, 
	Georgi Djakov <djakov@...nel.org>, Pramod Gurav <pramod.gurav@...aro.org>, linux-mmc@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci-msm: pervent access to suspended controller

On Thu, 21 Mar 2024 at 15:30, Mantas Pucka <mantas@...vices.com> wrote:
>
> Generic sdhci code registers LED device and uses host->runtime_suspended
> flag to protect access to it. The sdhci-msm driver doesn't set this flag,
> which causes a crash when LED is accessed while controller is runtime
> suspended. Fix this by setting the flag correctly.
>
> Cc: stable@...r.kernel.org
> Fixes: 67e6db113c90 ("mmc: sdhci-msm: Add pm_runtime and system PM support")
> Signed-off-by: Mantas Pucka <mantas@...vices.com>

Applied for fixes, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-msm.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 668e0aceeeba..e113b99a3eab 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2694,6 +2694,11 @@ static __maybe_unused int sdhci_msm_runtime_suspend(struct device *dev)
>         struct sdhci_host *host = dev_get_drvdata(dev);
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>         struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&host->lock, flags);
> +       host->runtime_suspended = true;
> +       spin_unlock_irqrestore(&host->lock, flags);
>
>         /* Drop the performance vote */
>         dev_pm_opp_set_rate(dev, 0);
> @@ -2708,6 +2713,7 @@ static __maybe_unused int sdhci_msm_runtime_resume(struct device *dev)
>         struct sdhci_host *host = dev_get_drvdata(dev);
>         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>         struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +       unsigned long flags;
>         int ret;
>
>         ret = clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
> @@ -2726,7 +2732,15 @@ static __maybe_unused int sdhci_msm_runtime_resume(struct device *dev)
>
>         dev_pm_opp_set_rate(dev, msm_host->clk_rate);
>
> -       return sdhci_msm_ice_resume(msm_host);
> +       ret = sdhci_msm_ice_resume(msm_host);
> +       if (ret)
> +               return ret;
> +
> +       spin_lock_irqsave(&host->lock, flags);
> +       host->runtime_suspended = false;
> +       spin_unlock_irqrestore(&host->lock, flags);
> +
> +       return ret;
>  }
>
>  static const struct dev_pm_ops sdhci_msm_pm_ops = {
>
> ---
> base-commit: e8f897f4afef0031fe618a8e94127a0934896aba
> change-id: 20240321-sdhci-mmc-suspend-34f4af1d0286
>
> Best regards,
> --
> Mantas Pucka <mantas@...vices.com>
>