From: Simon Glass <sjg@chromium.org>
Date: Fri, 3 Jul 2015 00:16:16 +0000 (-0600)
Subject: dm: gpio: Check a GPIO is valid before using it
X-Git-Tag: v2015.10-rc2~394^2~38
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eca4866586ca36a47cd94811a294ac62ebd17abc;p=platform%2Fkernel%2Fu-boot.git

dm: gpio: Check a GPIO is valid before using it

Since a gpio_desc is allowed to be invalid we should return an error
indicating that the operation cannot be completed. This can happen if the
GPIO is optional - e.g. some devices may have a reset line and some may
not.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 4efda31..4cce11f 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -250,8 +250,12 @@ int gpio_free(unsigned gpio)
 
 static int check_reserved(struct gpio_desc *desc, const char *func)
 {
-	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc->dev);
+	struct gpio_dev_priv *uc_priv;
+
+	if (!dm_gpio_is_valid(desc))
+		return -ENOENT;
 
+	uc_priv = dev_get_uclass_priv(desc->dev);
 	if (!uc_priv->name[desc->offset]) {
 		printf("%s: %s: error: gpio %s%d not reserved\n",
 		       desc->dev->name, func,