From e324ce61ef483dd26d03502d35666ad48a2e1b33 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Mon, 24 Dec 2012 09:32:46 -0800 Subject: [PATCH] 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 Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/gpio_keys.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) 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)) {