mmc: sdhci-acpi: support deferred probe

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>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 278a5a4..9dcb704 100644 (file)
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -467,7 +467,10 @@ 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;
                }