[PATCH V4] mmc: sdhci-acpi: support deferred probe

[PATCH V4] mmc: sdhci-acpi: support deferred probe

[Zhang Rui]

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.

CC: stable@vger.kernel.org # v4.9
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=177101
Tested-by: Jonas Aaberg <cja@gmx.net>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-acpi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 160f695..5440323 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -466,7 +466,10 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 	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;
 		}
-- 
2.7.4

Re: [PATCH V4] mmc: sdhci-acpi: support deferred probe

[Ulf Hansson]

On 18 January 2017 at 10:46, Zhang Rui <rui.zhang@intel.com> wrote:
> 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.
>
> CC: stable@vger.kernel.org # v4.9
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=177101
> Tested-by: Jonas Aaberg <cja@gmx.net>
> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> Acked-by: Adrian Hunter <adrian.hunter@intel.com>

Thanks, applied for next!

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-acpi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
> index 160f695..5440323 100644
> --- a/drivers/mmc/host/sdhci-acpi.c
> +++ b/drivers/mmc/host/sdhci-acpi.c
> @@ -466,7 +466,10 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
>         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;
>                 }
> --
> 2.7.4
>