Input: gpio_keys - defer probing if GPIO probing is deferred

If of_get_gpio_flags() returns an error (as in case when GPIO probe is
deferred) the driver would attempt to claim invalid GPIO. It should
propagate the error code up the stack instead so that the probe either
fails or will be retried later (in case of -EPROBE_DEFER).

Cc: stable@vger.kernel.org
Reported-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index d327f5a2bb0e..b29ca651a395 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -602,6 +602,7 @@ gpio_keys_get_devtree_pdata(struct device *dev)
 
         i = 0;
         for_each_child_of_node(node, pp) {
+                int gpio;
                 enum of_gpio_flags flags;
 
                 if (!of_find_property(pp, "gpios", NULL)) {
@@ -610,9 +611,19 @@ gpio_keys_get_devtree_pdata(struct device *dev)
                         continue;
                 }
 
+                gpio = of_get_gpio_flags(pp, 0, &flags);
+                if (gpio < 0) {
+                        error = gpio;
+                        if (error != -EPROBE_DEFER)
+                                dev_err(dev,
+                                        "Failed to get gpio flags, error: %d\n",
+                                        error);
+                        goto err_free_pdata;
+                }
+
                 button = &pdata->buttons[i++];
 
-                button->gpio = of_get_gpio_flags(pp, 0, &flags);
+                button->gpio = gpio;
                 button->active_low = flags & OF_GPIO_ACTIVE_LOW;
 
                 if (of_property_read_u32(pp, "linux,code", &button->code)) {