gpiolib: rename the gpio_device notifier

Change the generic "notifier" name to "line_state_notifier" in order to
reflect its purpose in preparation for adding a second notifier which
will be used to notify wait queues about device unregistering.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kent Gibson <warthog618@gmail.com>

Author: Bartosz Golaszewski

drivers/gpio/gpiolib-cdev.c

@@ -230,7 +230,7 @@ static long linehandle_set_config(struct linehandle_state *lh,
 				return ret;
 		}
 
-		blocking_notifier_call_chain(&desc->gdev->notifier,
+		blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 					     GPIO_V2_LINE_CHANGED_CONFIG,
 					     desc);
 	}
@@ -414,7 +414,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 				goto out_free_lh;
 		}
 
-		blocking_notifier_call_chain(&desc->gdev->notifier,
+		blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 					     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
 
 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
@@ -1407,7 +1407,7 @@ static long linereq_set_config_unlocked(struct linereq *lr,
 
 		WRITE_ONCE(line->edflags, edflags);
 
-		blocking_notifier_call_chain(&desc->gdev->notifier,
+		blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 					     GPIO_V2_LINE_CHANGED_CONFIG,
 					     desc);
 	}
@@ -1720,7 +1720,7 @@ static int linereq_create(struct gpio_device *gdev, void __user *ip)
 
 		lr->lines[i].edflags = edflags;
 
-		blocking_notifier_call_chain(&desc->gdev->notifier,
+		blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 					     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
 
 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
@@ -2117,7 +2117,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
 	if (ret)
 		goto out_free_le;
 
-	blocking_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 				     GPIO_V2_LINE_CHANGED_REQUESTED, desc);
 
 	irq = gpiod_to_irq(desc);
@@ -2671,7 +2671,7 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
 	cdev->gdev = gpio_device_get(gdev);
 
 	cdev->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify;
-	ret = blocking_notifier_chain_register(&gdev->notifier,
+	ret = blocking_notifier_chain_register(&gdev->line_state_notifier,
 					       &cdev->lineinfo_changed_nb);
 	if (ret)
 		goto out_free_bitmap;
@@ -2687,7 +2687,7 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
 	return ret;
 
 out_unregister_notifier:
-	blocking_notifier_chain_unregister(&gdev->notifier,
+	blocking_notifier_chain_unregister(&gdev->line_state_notifier,
 					   &cdev->lineinfo_changed_nb);
 out_free_bitmap:
 	gpio_device_put(gdev);
@@ -2711,7 +2711,7 @@ static int gpio_chrdev_release(struct inode *inode, struct file *file)
 	struct gpio_device *gdev = cdev->gdev;
 
 	bitmap_free(cdev->watched_lines);
-	blocking_notifier_chain_unregister(&gdev->notifier,
+	blocking_notifier_chain_unregister(&gdev->line_state_notifier,
 					   &cdev->lineinfo_changed_nb);
 	gpio_device_put(gdev);
 	kfree(cdev);

drivers/gpio/gpiolib.c

@@ -847,7 +847,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
 
-	BLOCKING_INIT_NOTIFIER_HEAD(&gdev->notifier);
+	BLOCKING_INIT_NOTIFIER_HEAD(&gdev->line_state_notifier);
 	init_rwsem(&gdev->sem);
 
 #ifdef CONFIG_PINCTRL
@@ -2177,7 +2177,7 @@ static bool gpiod_free_commit(struct gpio_desc *desc)
 	}
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
-	blocking_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 				     GPIOLINE_CHANGED_RELEASED, desc);
 
 	return ret;
@@ -4007,7 +4007,7 @@ static struct gpio_desc *gpiod_find_and_request(struct device *consumer,
 		return ERR_PTR(ret);
 	}
 
-	blocking_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->line_state_notifier,
 				     GPIOLINE_CHANGED_REQUESTED, desc);
 
 	return desc;

drivers/gpio/gpiolib.h

@@ -39,8 +39,8 @@
  * or name of the IP component in a System on Chip.
  * @data: per-instance data assigned by the driver
  * @list: links gpio_device:s together for traversal
- * @notifier: used to notify subscribers about lines being requested, released
- *            or reconfigured
+ * @line_state_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
@@ -64,7 +64,7 @@ struct gpio_device {
 	const char		*label;
 	void			*data;
 	struct list_head        list;
-	struct blocking_notifier_head notifier;
+	struct blocking_notifier_head line_state_notifier;
 	struct rw_semaphore	sem;
 
 #ifdef CONFIG_PINCTRL