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authorJohan Hovold <johan@kernel.org>2015-01-13 13:00:04 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-01-15 17:19:45 +0100
commit121b6a79955a3a3fd7bbb9b8cb88d5b9dad6283d (patch)
tree4d2ede45420b2d5f9e2af0279c75c11dbad28112 /drivers/gpio/gpiolib-sysfs.c
parentgpio: unregister gpiochip device before removing it (diff)
downloadlinux-121b6a79955a3a3fd7bbb9b8cb88d5b9dad6283d.tar.xz
linux-121b6a79955a3a3fd7bbb9b8cb88d5b9dad6283d.zip
gpio: sysfs: fix gpio-chip device-attribute leak
The gpio-chip device attributes were never destroyed when the device was removed. Fix by using device_create_with_groups() to create the device attributes of the chip class device. Note that this also fixes the attribute-creation race with userspace. Fixes: d8f388d8dc8d ("gpio: sysfs interface") Cc: stable <stable@vger.kernel.org> # v2.6.27+ Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib-sysfs.c')
-rw-r--r--drivers/gpio/gpiolib-sysfs.c19
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 2ac1800b58bb..33cf4bd0ed2d 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -400,16 +400,13 @@ static ssize_t chip_ngpio_show(struct device *dev,
}
static DEVICE_ATTR(ngpio, 0444, chip_ngpio_show, NULL);
-static const struct attribute *gpiochip_attrs[] = {
+static struct attribute *gpiochip_attrs[] = {
&dev_attr_base.attr,
&dev_attr_label.attr,
&dev_attr_ngpio.attr,
NULL,
};
-
-static const struct attribute_group gpiochip_attr_group = {
- .attrs = (struct attribute **) gpiochip_attrs,
-};
+ATTRIBUTE_GROUPS(gpiochip);
/*
* /sys/class/gpio/export ... write-only
@@ -750,13 +747,13 @@ int gpiochip_export(struct gpio_chip *chip)
/* use chip->base for the ID; it's already known to be unique */
mutex_lock(&sysfs_lock);
- dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0), chip,
- "gpiochip%d", chip->base);
- if (!IS_ERR(dev)) {
- status = sysfs_create_group(&dev->kobj,
- &gpiochip_attr_group);
- } else
+ dev = device_create_with_groups(&gpio_class, chip->dev, MKDEV(0, 0),
+ chip, gpiochip_groups,
+ "gpiochip%d", chip->base);
+ if (IS_ERR(dev))
status = PTR_ERR(dev);
+ else
+ status = 0;
chip->exported = (status == 0);
mutex_unlock(&sysfs_lock);