iio:core: 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.

In doing so we have to remove a guard statement from cdev_del,
but this doesn't appear to be required in any way.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index d18ded4..26a03c6 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1720,18 +1720,13 @@ int iio_device_register(struct iio_dev *indio_dev)
 
        cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
        indio_dev->chrdev.owner = indio_dev->info->driver_module;
-       indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
-       ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
-       if (ret < 0)
-               goto error_unreg_eventset;
 
-       ret = device_add(&indio_dev->dev);
+       ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
        if (ret < 0)
-               goto error_cdev_del;
+               goto error_unreg_eventset;
 
        return 0;
-error_cdev_del:
-       cdev_del(&indio_dev->chrdev);
+
 error_unreg_eventset:
        iio_device_unregister_eventset(indio_dev);
 error_free_sysfs:
@@ -1752,10 +1747,8 @@ void iio_device_unregister(struct iio_dev *indio_dev)
 {
        mutex_lock(&indio_dev->info_exist_lock);
 
-       device_del(&indio_dev->dev);
+       cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
 
-       if (indio_dev->chrdev.dev)
-               cdev_del(&indio_dev->chrdev);
        iio_device_unregister_debugfs(indio_dev);
 
        iio_disable_all_buffers(indio_dev);