linux-kernel - [PATCH] gpio: gpio-ich: fix ichx_gpio_check_available() return what callers expect

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Date:	Wed, 27 Feb 2013 17:25:15 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	Peter Tyser <ptyser@...-inc.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] gpio: gpio-ich: fix ichx_gpio_check_available() return what callers expect

ichx_gpio_check_available() returns either 0 or -ENXIO depending on whether
the given GPIO is available or not. However, callers of this function treat
the return value as boolean:

	...
	if (!ichx_gpio_check_available(gpio, nr))
		return -ENXIO;

which erroneusly fails when the GPIO is available and not vice versa.

Fix this by making the function return boolean as expected by the callers.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/gpio/gpio-ich.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-ich.c b/drivers/gpio/gpio-ich.c
index 6f2306d..f9dbd50 100644
--- a/drivers/gpio/gpio-ich.c
+++ b/drivers/gpio/gpio-ich.c
@@ -128,9 +128,9 @@ static int ichx_read_bit(int reg, unsigned nr)
 	return data & (1 << bit) ? 1 : 0;
 }
 
-static int ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
+static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
 {
-	return (ichx_priv.use_gpio & (1 << (nr / 32))) ? 0 : -ENXIO;
+	return ichx_priv.use_gpio & (1 << (nr / 32));
 }
 
 static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
-- 
1.7.10.4

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