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Message-Id: <20200708041600.768775-10-warthog618@gmail.com>
Date: Wed, 8 Jul 2020 12:15:52 +0800
From: Kent Gibson <warthog618@...il.com>
To: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
bgolaszewski@...libre.com, linus.walleij@...aro.org
Cc: Kent Gibson <warthog618@...il.com>
Subject: [PATCH 09/17] gpiolib: cdev: rename priv to cdev
Rename priv to cdev to improve readability.
The name "priv" indicates that the object is pointed to by
file->private_data, not what the object is actually is.
As it is always used to point to a struct gpio_chardev_data, renaming
it to cdev is more appropriate.
Signed-off-by: Kent Gibson <warthog618@...il.com>
---
drivers/gpio/gpiolib-cdev.c | 90 ++++++++++++++++++-------------------
1 file changed, 45 insertions(+), 45 deletions(-)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 352d815bbd07..fe1b385deecc 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -826,8 +826,8 @@ struct gpio_chardev_data {
*/
static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct gpio_chardev_data *priv = file->private_data;
- struct gpio_device *gdev = priv->gdev;
+ struct gpio_chardev_data *cdev = file->private_data;
+ struct gpio_device *gdev = cdev->gdev;
struct gpio_chip *gc = gdev->chip;
void __user *ip = (void __user *)arg;
struct gpio_desc *desc;
@@ -887,7 +887,7 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
hwgpio = gpio_chip_hwgpio(desc);
- if (test_bit(hwgpio, priv->watched_lines))
+ if (test_bit(hwgpio, cdev->watched_lines))
return -EBUSY;
gpio_desc_to_lineinfo(desc, &lineinfo);
@@ -895,7 +895,7 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
return -EFAULT;
- set_bit(hwgpio, priv->watched_lines);
+ set_bit(hwgpio, cdev->watched_lines);
return 0;
} else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
if (copy_from_user(&offset, ip, sizeof(offset)))
@@ -907,10 +907,10 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
hwgpio = gpio_chip_hwgpio(desc);
- if (!test_bit(hwgpio, priv->watched_lines))
+ if (!test_bit(hwgpio, cdev->watched_lines))
return -EBUSY;
- clear_bit(hwgpio, priv->watched_lines);
+ clear_bit(hwgpio, cdev->watched_lines);
return 0;
}
return -EINVAL;
@@ -933,12 +933,12 @@ to_gpio_chardev_data(struct notifier_block *nb)
static int lineinfo_changed_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
- struct gpio_chardev_data *priv = to_gpio_chardev_data(nb);
+ struct gpio_chardev_data *cdev = to_gpio_chardev_data(nb);
struct gpioline_info_changed chg;
struct gpio_desc *desc = data;
int ret;
- if (!test_bit(gpio_chip_hwgpio(desc), priv->watched_lines))
+ if (!test_bit(gpio_chip_hwgpio(desc), cdev->watched_lines))
return NOTIFY_DONE;
memset(&chg, 0, sizeof(chg));
@@ -947,9 +947,9 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
chg.timestamp = ktime_get_ns();
gpio_desc_to_lineinfo(desc, &chg.info);
- ret = kfifo_in_spinlocked(&priv->events, &chg, 1, &priv->wait.lock);
+ ret = kfifo_in_spinlocked(&cdev->events, &chg, 1, &cdev->wait.lock);
if (ret)
- wake_up_poll(&priv->wait, EPOLLIN);
+ wake_up_poll(&cdev->wait, EPOLLIN);
else
pr_debug_ratelimited("lineinfo event FIFO is full - event dropped\n");
@@ -959,13 +959,13 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
static __poll_t lineinfo_watch_poll(struct file *file,
struct poll_table_struct *pollt)
{
- struct gpio_chardev_data *priv = file->private_data;
+ struct gpio_chardev_data *cdev = file->private_data;
__poll_t events = 0;
- poll_wait(file, &priv->wait, pollt);
+ poll_wait(file, &cdev->wait, pollt);
- if (!kfifo_is_empty_spinlocked_noirqsave(&priv->events,
- &priv->wait.lock))
+ if (!kfifo_is_empty_spinlocked_noirqsave(&cdev->events,
+ &cdev->wait.lock))
events = EPOLLIN | EPOLLRDNORM;
return events;
@@ -974,7 +974,7 @@ static __poll_t lineinfo_watch_poll(struct file *file,
static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
size_t count, loff_t *off)
{
- struct gpio_chardev_data *priv = file->private_data;
+ struct gpio_chardev_data *cdev = file->private_data;
struct gpioline_info_changed event;
ssize_t bytes_read = 0;
int ret;
@@ -983,28 +983,28 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
return -EINVAL;
do {
- spin_lock(&priv->wait.lock);
- if (kfifo_is_empty(&priv->events)) {
+ spin_lock(&cdev->wait.lock);
+ if (kfifo_is_empty(&cdev->events)) {
if (bytes_read) {
- spin_unlock(&priv->wait.lock);
+ spin_unlock(&cdev->wait.lock);
return bytes_read;
}
if (file->f_flags & O_NONBLOCK) {
- spin_unlock(&priv->wait.lock);
+ spin_unlock(&cdev->wait.lock);
return -EAGAIN;
}
- ret = wait_event_interruptible_locked(priv->wait,
- !kfifo_is_empty(&priv->events));
+ ret = wait_event_interruptible_locked(cdev->wait,
+ !kfifo_is_empty(&cdev->events));
if (ret) {
- spin_unlock(&priv->wait.lock);
+ spin_unlock(&cdev->wait.lock);
return ret;
}
}
- ret = kfifo_out(&priv->events, &event, 1);
- spin_unlock(&priv->wait.lock);
+ ret = kfifo_out(&cdev->events, &event, 1);
+ spin_unlock(&cdev->wait.lock);
if (ret != 1) {
ret = -EIO;
break;
@@ -1029,33 +1029,33 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
{
struct gpio_device *gdev = container_of(inode->i_cdev,
struct gpio_device, chrdev);
- struct gpio_chardev_data *priv;
+ struct gpio_chardev_data *cdev;
int ret = -ENOMEM;
/* Fail on open if the backing gpiochip is gone */
if (!gdev->chip)
return -ENODEV;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv)
+ cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+ if (!cdev)
return -ENOMEM;
- priv->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL);
- if (!priv->watched_lines)
- goto out_free_priv;
+ cdev->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL);
+ if (!cdev->watched_lines)
+ goto out_free_cdev;
- init_waitqueue_head(&priv->wait);
- INIT_KFIFO(priv->events);
- priv->gdev = gdev;
+ init_waitqueue_head(&cdev->wait);
+ INIT_KFIFO(cdev->events);
+ cdev->gdev = gdev;
- priv->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify;
+ cdev->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify;
ret = blocking_notifier_chain_register(&gdev->notifier,
- &priv->lineinfo_changed_nb);
+ &cdev->lineinfo_changed_nb);
if (ret)
goto out_free_bitmap;
get_device(&gdev->dev);
- file->private_data = priv;
+ file->private_data = cdev;
ret = nonseekable_open(inode, file);
if (ret)
@@ -1065,11 +1065,11 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
out_unregister_notifier:
blocking_notifier_chain_unregister(&gdev->notifier,
- &priv->lineinfo_changed_nb);
+ &cdev->lineinfo_changed_nb);
out_free_bitmap:
- bitmap_free(priv->watched_lines);
-out_free_priv:
- kfree(priv);
+ bitmap_free(cdev->watched_lines);
+out_free_cdev:
+ kfree(cdev);
return ret;
}
@@ -1081,14 +1081,14 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)
*/
static int gpio_chrdev_release(struct inode *inode, struct file *file)
{
- struct gpio_chardev_data *priv = file->private_data;
- struct gpio_device *gdev = priv->gdev;
+ struct gpio_chardev_data *cdev = file->private_data;
+ struct gpio_device *gdev = cdev->gdev;
- bitmap_free(priv->watched_lines);
+ bitmap_free(cdev->watched_lines);
blocking_notifier_chain_unregister(&gdev->notifier,
- &priv->lineinfo_changed_nb);
+ &cdev->lineinfo_changed_nb);
put_device(&gdev->dev);
- kfree(priv);
+ kfree(cdev);
return 0;
}
--
2.27.0
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