gpio: Convert gpio_is_valid to return bool

Make the code a bit more readable.

Instead of casting an int to an unsigned then comparing to
MAX_NR_GPIOS, add a >= 0 test and let the compiler optimizer
do the conversion to unsigned.

The generated code should be the same.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 5 insertions, 5 deletions

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index ff5c66080c8c..a98b52cb970b 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -35,9 +35,9 @@
  * platform data and other tables.
  */
 
-static inline int gpio_is_valid(int number)
+static inline bool gpio_is_valid(int number)
 {
-        return ((unsigned)number) < ARCH_NR_GPIOS;
+        return number >= 0 && number < ARCH_NR_GPIOS;
 }
 
 struct device;
@@ -212,7 +212,7 @@ extern void gpio_unexport(unsigned gpio);
 
 #else   /* !CONFIG_GPIOLIB */
 
-static inline int gpio_is_valid(int number)
+static inline bool gpio_is_valid(int number)
 {
         /* only non-negative numbers are valid */
         return number >= 0;
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 32720baf70f1..0f8265f8e8c3 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -25,9 +25,9 @@ struct gpio_chip;
  * warning when something is wrongly called.
  */
 
-static inline int gpio_is_valid(int number)
+static inline bool gpio_is_valid(int number)
 {
-        return 0;
+        return false;
 }
 
 static inline int gpio_request(unsigned gpio, const char *label)