linux-kernel - Re: [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in dwcmshc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <22e6ab4c-be8d-44d5-b430-e7282bae34ab@intel.com>
Date: Thu, 21 Mar 2024 13:46:21 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Liming Sun <limings@...dia.com>, Ulf Hansson <ulf.hansson@...aro.org>,
 David Thompson <davthompson@...dia.com>, Shawn Lin <shawn.lin@...k-chips.com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] sdhci-of-dwcmshc: disable PM runtime in
 dwcmshc_remove()

On 19/03/24 18:16, Liming Sun wrote:
> This commit disables PM runtime in dwcmshc_remove() to avoid the
> error message below when reloading the sdhci-of-dwcmshc.ko
> 
>   sdhci-dwcmshc MLNXBF30:00: Unbalanced pm_runtime_enable!
> 
> Fixes: 48fe8fadbe5e ("mmc: sdhci-of-dwcmshc: Add runtime PM operations")
> Reviewed-by: David Thompson <davthompson@...dia.com>
> Signed-off-by: Liming Sun <limings@...dia.com>

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

> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index ab4b964d4058..1d8f5a76096a 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -999,6 +999,17 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  	return err;
>  }
>  
> +static void dwcmshc_disable_card_clk(struct sdhci_host *host)
> +{
> +	u16 ctrl;
> +
> +	ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +	if (ctrl & SDHCI_CLOCK_CARD_EN) {
> +		ctrl &= ~SDHCI_CLOCK_CARD_EN;
> +		sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> +	}
> +}
> +
>  static void dwcmshc_remove(struct platform_device *pdev)
>  {
>  	struct sdhci_host *host = platform_get_drvdata(pdev);
> @@ -1006,8 +1017,14 @@ static void dwcmshc_remove(struct platform_device *pdev)
>  	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
>  	struct rk35xx_priv *rk_priv = priv->priv;
>  
> +	pm_runtime_get_sync(&pdev->dev);
> +	pm_runtime_disable(&pdev->dev);
> +	pm_runtime_put_noidle(&pdev->dev);
> +
>  	sdhci_remove_host(host, 0);
>  
> +	dwcmshc_disable_card_clk(host);
> +
>  	clk_disable_unprepare(pltfm_host->clk);
>  	clk_disable_unprepare(priv->bus_clk);
>  	if (rk_priv)
> @@ -1099,17 +1116,6 @@ static void dwcmshc_enable_card_clk(struct sdhci_host *host)
>  	}
>  }
>  
> -static void dwcmshc_disable_card_clk(struct sdhci_host *host)
> -{
> -	u16 ctrl;
> -
> -	ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> -	if (ctrl & SDHCI_CLOCK_CARD_EN) {
> -		ctrl &= ~SDHCI_CLOCK_CARD_EN;
> -		sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> -	}
> -}
> -
>  static int dwcmshc_runtime_suspend(struct device *dev)
>  {
>  	struct sdhci_host *host = dev_get_drvdata(dev);