diff options
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index d900ecdbac46..b3c2db6eba80 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -15,14 +15,15 @@ #include <linux/device.h> #include <linux/module.h> #include <linux/cdev.h> +#include <linux/rwsem.h> #define GPIOCHIP_NAME "gpiochip" /** * struct gpio_device - internal state container for GPIO devices - * @id: numerical ID number for the GPIO chip * @dev: the GPIO device struct * @chrdev: character device for the GPIO device + * @id: numerical ID number for the GPIO chip * @mockdev: class device used by the deprecated sysfs interface (may be * NULL) * @owner: helps prevent removal of modules exporting active GPIOs @@ -39,6 +40,9 @@ * @list: links gpio_device:s together for traversal * @notifier: used to notify subscribers about lines being requested, released * or reconfigured + * @sem: protects the structure from a NULL-pointer dereference of @chip by + * user-space operations when the device gets unregistered during + * a hot-unplug event * @pin_ranges: range of pins served by the GPIO driver * * This state container holds most of the runtime variable data @@ -47,9 +51,9 @@ * userspace. */ struct gpio_device { - int id; struct device dev; struct cdev chrdev; + int id; struct device *mockdev; struct module *owner; struct gpio_chip *chip; @@ -60,6 +64,7 @@ struct gpio_device { void *data; struct list_head list; struct blocking_notifier_head notifier; + struct rw_semaphore sem; #ifdef CONFIG_PINCTRL /* @@ -72,6 +77,11 @@ struct gpio_device { #endif }; +static inline struct gpio_device *to_gpio_device(struct device *dev) +{ + return container_of(dev, struct gpio_device, dev); +} + /* gpio suffixes used for ACPI and device tree lookup */ static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" }; |