diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-08-17 14:59:05 +0300 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2023-08-21 16:57:05 +0300 |
| commit | a067419ba77da830939852758702388f0fba09a1 (patch) | |
| tree | 387593531b96b4c5a2bd0c6d6c7cc8cc2ddc514a /drivers/gpio | |
| parent | e82bbd6761f7e313141c4033ebb79e3d397b6a9c (diff) | |
| download | linux-a067419ba77da830939852758702388f0fba09a1.tar.xz | |
gpiolib: add a second blocking notifier to struct gpio_device
Add a new blocking notifier to struct gpio_device and use it to notify
subscribers about the GPIO device being unregistered from the device
model.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.c | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpiolib.h | 3 |
3 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 91bdd3b928b5..fec446510028 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -2748,4 +2748,5 @@ int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt) void gpiolib_cdev_unregister(struct gpio_device *gdev) { cdev_device_del(&gdev->chrdev, &gdev->dev); + blocking_notifier_call_chain(&gdev->device_notifier, 0, NULL); } diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 38640df1d798..8f74e0bb2a5c 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -848,6 +848,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, spin_unlock_irqrestore(&gpio_lock, flags); BLOCKING_INIT_NOTIFIER_HEAD(&gdev->line_state_notifier); + BLOCKING_INIT_NOTIFIER_HEAD(&gdev->device_notifier); init_rwsem(&gdev->sem); #ifdef CONFIG_PINCTRL diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 11a5e02f317d..e860ed434bc2 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -41,6 +41,8 @@ * @list: links gpio_device:s together for traversal * @line_state_notifier: used to notify subscribers about lines being * requested, released or reconfigured + * @device_notifier: used to notify character device wait queues about the GPIO + * device being unregistered * @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 @@ -65,6 +67,7 @@ struct gpio_device { void *data; struct list_head list; struct blocking_notifier_head line_state_notifier; + struct blocking_notifier_head device_notifier; struct rw_semaphore sem; #ifdef CONFIG_PINCTRL |