linux-kernel - [PATCH 3.19.y-ckt 010/102] gpio: gpio-kempld: Fix get

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Date:	Tue,  7 Jul 2015 11:22:00 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Michael Brunner <michael.brunner@...tron.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 010/102] gpio: gpio-kempld: Fix get_direction return value

3.19.8-ckt3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Brunner <mibru@....de>

commit f230e8ffc03f17bd9d6b90ea890b8252a8cc1821 upstream.

This patch fixes an inverted return value of the gpio get_direction
function.

The wrong value causes the direction sysfs entry and GPIO debugfs file
to indicate incorrect GPIO direction settings. In some cases it also
prevents setting GPIO output values.

The problem is also present in all other stable kernel versions since
linux-3.12.

Reported-by: Jochen Henneberg <jh@...neberg-systemdesign.com>
Signed-off-by: Michael Brunner <michael.brunner@...tron.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpio/gpio-kempld.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-kempld.c b/drivers/gpio/gpio-kempld.c
index 443518f..a6b0def 100644
--- a/drivers/gpio/gpio-kempld.c
+++ b/drivers/gpio/gpio-kempld.c
@@ -117,7 +117,7 @@ static int kempld_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 		= container_of(chip, struct kempld_gpio_data, chip);
 	struct kempld_device_data *pld = gpio->pld;
 
-	return kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset), offset);
+	return !kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset), offset);
 }
 
 static int kempld_gpio_pincount(struct kempld_device_data *pld)
-- 
1.9.1

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