Re: [PATCH v6 8/8] mmc: sdhci-esdhc-imx: fix resume error handling

[Frank Li]

On Mon, Jul 13, 2026 at 12:39:04PM +0800, ziniu.wang_1@xxxxxxxxxxx wrote:
> From: Luke Wang <ziniu.wang_1@xxxxxxx>
>
> Check pm_runtime_force_resume() return value in resume. If it fails
> (clock enable failure), return immediately since accessing hardware
> registers on an unclocked device would cause a kernel panic.
>
> The early return intentionally skips enable_irq() and
> sdhci_disable_irq_wakeups() because the IRQ handler reads
> SDHCI_INT_STATUS, which would also fault without clocks. The PM runtime
> usage counter leak only affects this already-broken device instance and
> is an acceptable tradeoff to preserve system stability.
>
> Remove the return value check for mmc_gpio_set_cd_wake(host->mmc, false)
> since disable_irq_wake() called internally always returns 0.
>
> Also return 0 explicitly on the success path instead of propagating
> stale return values.
>
> Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
> Signed-off-by: Luke Wang <ziniu.wang_1@xxxxxxx>
> ---

Reviewed-by: Frank Li <Frank.Li@xxxxxxx>

>  drivers/mmc/host/sdhci-esdhc-imx.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 6cb84690fde4..f4bfb14423e4 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -2126,12 +2126,12 @@ static int sdhci_esdhc_resume(struct device *dev)
>  			dev_warn(dev, "Failed to restore pinctrl state\n");
>  	}
>
> -	pm_runtime_force_resume(dev);
> -
> -	ret = mmc_gpio_set_cd_wake(host->mmc, false);
> +	ret = pm_runtime_force_resume(dev);
>  	if (ret)
>  		return ret;
>
> +	mmc_gpio_set_cd_wake(host->mmc, false);
> +
>  	/* re-initialize hw state in case it's lost in low power mode */
>  	sdhci_esdhc_imx_hwinit(host);
>
> @@ -2158,7 +2158,7 @@ static int sdhci_esdhc_resume(struct device *dev)
>
>  	pm_runtime_put_autosuspend(dev);
>
> -	return ret;
> +	return 0;
>  }
>
>  static int sdhci_esdhc_runtime_suspend(struct device *dev)
> --
> 2.34.1
>
>