gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low

commit 49d2ca84e433dab854c7a866bc6add09cfab682d upstream.

Fix memory leak in the gpio sysfs interface due to failure to drop
reference to device returned by class_find_device when setting the
gpio-line polarity.

Fixes: 0769746183ca ("gpiolib: add support for changing value polarity
in sysfs")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
[lizf: Backported to 3.4: adjust filename]
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 011d1340252551b94b64910a341dc4caa36b6337..7cb3cb94c672d686621e4be0bd1434b083f2be6b 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -876,7 +876,7 @@ int gpio_sysfs_set_active_low(unsigned gpio, int value)
        }
 
        status = sysfs_set_active_low(desc, dev, value);
-
+       put_device(dev);
 unlock:
        mutex_unlock(&sysfs_lock);