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

Adrian Hunter
2024-03-26T10:25:25Z

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@vger.kernel.org
> Fixes: 67e6db113c90 ("mmc: sdhci-msm: Add pm_runtime and system PM support")
> Signed-off-by: Mantas Pucka <mantas@8devices.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.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,