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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2012-12-24 21:32:46 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-12-24 21:51:30 +0400
commite324ce61ef483dd26d03502d35666ad48a2e1b33 (patch)
tree8ab6bb928fb008beb37f0fa6a3b361f980dc5e5e /drivers/input/keyboard/gpio_keys.c
parentd46329a708c1a3301e272a029266b69339c0877f (diff)
downloadlinux-e324ce61ef483dd26d03502d35666ad48a2e1b33.tar.xz
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>
Diffstat (limited to 'drivers/input/keyboard/gpio_keys.c')
-rw-r--r--drivers/input/keyboard/gpio_keys.c13
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)) {