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gpiolib: utilize new cdev_device_add helper function 

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Logan Gunthorpe 2017-03-17 12:48:12 -06:00 committed by Greg Kroah-Hartman
parent 358a89ca2c
commit 111379dccc
1 changed files with 8 additions and 15 deletions
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21
drivers/gpio/gpiolib.c
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@ -1035,18 +1035,14 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
cdev_init(&gdev->chrdev, &gpio_fileops);
gdev->chrdev.owner = THIS_MODULE;
gdev->chrdev.kobj.parent = &gdev->dev.kobj;
gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id);
status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1);
if (status < 0)
chip_warn(gdev->chip, "failed to add char device %d:%d\n",
MAJOR(gpio_devt), gdev->id);
else
status = cdev_device_add(&gdev->chrdev, &gdev->dev);
if (status)
return status;
chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n",
MAJOR(gpio_devt), gdev->id);
status = device_add(&gdev->dev);
if (status)
goto err_remove_chardev;
status = gpiochip_sysfs_register(gdev);
if (status)
@ -1061,9 +1057,7 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
return 0;
err_remove_device:
device_del(&gdev->dev);
err_remove_chardev:
cdev_del(&gdev->chrdev);
cdev_device_del(&gdev->chrdev, &gdev->dev);
return status;
}
@ -1347,8 +1341,7 @@ void gpiochip_remove(struct gpio_chip *chip)
* be removed, else it will be dangling until the last user is
* gone.
*/
cdev_del(&gdev->chrdev);
device_del(&gdev->dev);
cdev_device_del(&gdev->chrdev, &gdev->dev);
put_device(&gdev->dev);
}
EXPORT_SYMBOL_GPL(gpiochip_remove);