Commit f4833b8c authored by Ricardo Ribalda Delgado's avatar Ricardo Ribalda Delgado Committed by Linus Walleij

gpiolib: Fix unaligned used of reference counters

gpiolib relies on the reference counters to clean up the gpio_device

Although the number of get/put is properly aligned on gpiolib.c
itself, it does not take into consideration how the referece counters
are affected by other external functions such as cdev_add and device_add.

Because of this, after the last call to put_device, the reference counter
has a value of +3, therefore never calling gpiodevice_release.

Due to the fact that some of the device  has already been cleaned on
gpiochip_remove, the library will end up OOPsing the kernel (e.g. a call
to of_gpiochip_find_and_xlate).

Signed-off-by: Ricardo Ribalda Delgado's avatarRicardo Ribalda Delgado <>
Signed-off-by: Linus Walleij's avatarLinus Walleij <>
parent 11f33a6d
......@@ -449,7 +449,6 @@ static void gpiodevice_release(struct device *dev)
struct gpio_device *gdev = dev_get_drvdata(dev);
ida_simple_remove(&gpio_ida, gdev->id);
......@@ -482,7 +481,6 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
/* From this point, the .release() function cleans up gpio_device */
gdev->dev.release = gpiodevice_release;
pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n",
__func__, gdev->base, gdev->base + gdev->ngpio - 1,
dev_name(&gdev->dev), gdev->chip->label ? : "generic");
......@@ -770,6 +768,8 @@ void gpiochip_remove(struct gpio_chip *chip)
* be removed, else it will be dangling until the last user is
* gone.
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