From: Peng Fan <van.freenix@gmail.com>
Date: Mon, 24 Aug 2015 17:42:25 +0000 (-0700)
Subject: Input: gpio-keys - report error when disabling unsupported key
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4ea14a53d8f881034fa9e186653821c4e3d9a8fb;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

Input: gpio-keys - report error when disabling unsupported key

When trying to disable a key that is not supported by the device we should
report error, not do nothing and report success:

root@yocto:/sys/devices/soc0/gpio-keys# cat keys
114-116
root@yocto:/sys/devices/soc0/gpio-keys# echo 77 > keys
root@yocto:/sys/devices/soc0/gpio-keys#

We want 'echo 77 > keys' to report an error, but silence to give us an
illusion that all is 'ok'.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 1df4507c4c0b..9d517ca7eb5a 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -239,6 +239,11 @@ static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata,
 		}
 	}
 
+	if (i == ddata->pdata->nbuttons) {
+		error = -EINVAL;
+		goto out;
+	}
+
 	mutex_lock(&ddata->disable_lock);
 
 	for (i = 0; i < ddata->pdata->nbuttons; i++) {