diff options
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index e443c1023a37..b3c2db6eba80 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -15,6 +15,7 @@ #include <linux/device.h> #include <linux/module.h> #include <linux/cdev.h> +#include <linux/rwsem.h> #define GPIOCHIP_NAME "gpiochip" @@ -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 @@ -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 /* |