linux-kernel - Re: [PATCH 4.10 012/167] mmc: sdhci-acpi: support deferred probe

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Message-ID: <20170326112619.GA4209@dell-m4800.Home>
Date:   Sun, 26 Mar 2017 12:26:19 +0100
From:   Andrey Utkin <andrey_utkin@...tmail.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jonas Aaberg <cja@....net>, Zhang Rui <rui.zhang@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 4.10 012/167] mmc: sdhci-acpi: support deferred probe

On Fri, Mar 10, 2017 at 10:07:35AM +0100, Greg Kroah-Hartman wrote:
> 4.10-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Zhang Rui <rui.zhang@...el.com>
> 
> commit e28d6f048799acb0014491e6b74e580d84bd7916 upstream.
> 
> With commit 67bf5156edc4 ("gpio / ACPI: fix returned error from
> acpi_dev_gpio_irq_get()"), mmc_gpiod_request_cd() returns -EPROBE_DEFER if
> GPIO is not ready when sdhci-acpi driver is probed, and sdhci-acpi driver
> should be probed again later in this case.
> 
> This fixes an order issue when both GPIO and sdhci-acpi drivers are built
> as modules.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=177101
> Tested-by: Jonas Aaberg <cja@....net>
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
>  drivers/mmc/host/sdhci-acpi.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> --- a/drivers/mmc/host/sdhci-acpi.c
> +++ b/drivers/mmc/host/sdhci-acpi.c
> @@ -467,7 +467,10 @@ static int sdhci_acpi_probe(struct platf
>  	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
>  		bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
>  
> -		if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
> +		err = mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL);
> +		if (err) {
> +			if (err == -EPROBE_DEFER)
> +				goto err_free;
>  			dev_warn(dev, "failed to setup card detect gpio\n");
>  			c->use_runtime_pm = false;
>  		}
> 
> 

Regression reported: https://bugzilla.kernel.org/show_bug.cgi?id=194871

Reverting this patch is said to fix the issue for 4.10.2.