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

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Message-ID: <2e712cf6-7521-4c0b-b6fd-76bacc309496@intel.com>
Date: Tue, 26 Mar 2024 12:25:17 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Mantas Pucka <mantas@...vices.com>, Bjorn Andersson
 <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>,
 Ulf Hansson <ulf.hansson@...aro.org>, Georgi Djakov <djakov@...nel.org>,
 Pramod Gurav <pramod.gurav@...aro.org>,
 Ritesh Harjani <ritesh.list@...il.com>
Cc: 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 21/03/24 16:30, Mantas Pucka 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>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  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,