mmc: slot-gpio: Fix missing assignment to ctx->ro_gpio

mmc_gpio_request_ro() doesn't store the requested gpio in ctx->ro_gpio.
As a result, subsequent calls to mmc_gpio_get_ro() will always fail
with -ENOSYS because the gpio number isn't available to that function.

Cc: stable <stable@vger.kernel.org>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 058242916cef..08c6b3dfe080 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -100,7 +100,13 @@ int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
 
         ctx = host->slot.handler_priv;
 
-        return gpio_request_one(gpio, GPIOF_DIR_IN, ctx->ro_label);
+        ret = gpio_request_one(gpio, GPIOF_DIR_IN, ctx->ro_label);
+        if (ret < 0)
+                return ret;
+
+        ctx->ro_gpio = gpio;
+
+        return 0;
 }
 EXPORT_SYMBOL(mmc_gpio_request_ro);