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media: utilize new cdev_device_add helper function

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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>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Logan Gunthorpe 2017-03-17 12:48:18 -06:00 committed by Greg Kroah-Hartman
parent 38923911dc
commit 857313e510
2 changed files with 9 additions and 27 deletions
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16
drivers/media/cec/cec-core.c
View File

@ -137,24 +137,17 @@ static int __must_check cec_devnode_register(struct cec_devnode *devnode,
/* Part 2: Initialize and register the character device */
cdev_init(&devnode->cdev, &cec_devnode_fops);
devnode->cdev.kobj.parent = &devnode->dev.kobj;
devnode->cdev.owner = owner;
ret = cdev_add(&devnode->cdev, devnode->dev.devt, 1);
if (ret < 0) {
pr_err("%s: cdev_add failed\n", __func__);
ret = cdev_device_add(&devnode->cdev, &devnode->dev);
if (ret) {
pr_err("%s: cdev_device_add failed\n", __func__);
goto clr_bit;
}
ret = device_add(&devnode->dev);
if (ret)
goto cdev_del;
devnode->registered = true;
return 0;
cdev_del:
cdev_del(&devnode->cdev);
clr_bit:
mutex_lock(&cec_devnode_lock);
clear_bit(devnode->minor, cec_devnode_nums);
@ -190,8 +183,7 @@ static void cec_devnode_unregister(struct cec_devnode *devnode)
devnode->unregistered = true;
mutex_unlock(&devnode->lock);
device_del(&devnode->dev);
cdev_del(&devnode->cdev);
cdev_device_del(&devnode->cdev, &devnode->dev);
put_device(&devnode->dev);
}

20
drivers/media/media-devnode.c
View File

@ -248,31 +248,22 @@ int __must_check media_devnode_register(struct media_device *mdev,
dev_set_name(&devnode->dev, "media%d", devnode->minor);
device_initialize(&devnode->dev);
/* Part 2: Initialize and register the character device */
/* Part 2: Initialize the character device */
cdev_init(&devnode->cdev, &media_devnode_fops);
devnode->cdev.owner = owner;
devnode->cdev.kobj.parent = &devnode->dev.kobj;
ret = cdev_add(&devnode->cdev, MKDEV(MAJOR(media_dev_t), devnode->minor), 1);
/* Part 3: Add the media and char device */
ret = cdev_device_add(&devnode->cdev, &devnode->dev);
if (ret < 0) {
pr_err("%s: cdev_add failed\n", __func__);
pr_err("%s: cdev_device_add failed\n", __func__);
goto cdev_add_error;
}
/* Part 3: Add the media device */
ret = device_add(&devnode->dev);
if (ret < 0) {
pr_err("%s: device_add failed\n", __func__);
goto device_add_error;
}
/* Part 4: Activate this minor. The char device can now be used. */
set_bit(MEDIA_FLAG_REGISTERED, &devnode->flags);
return 0;
device_add_error:
cdev_del(&devnode->cdev);
cdev_add_error:
mutex_lock(&media_devnode_lock);
clear_bit(devnode->minor, media_devnode_nums);
@ -298,9 +289,8 @@ void media_devnode_unregister(struct media_devnode *devnode)
{
mutex_lock(&media_devnode_lock);
/* Delete the cdev on this minor as well */
cdev_del(&devnode->cdev);
cdev_device_del(&devnode->cdev, &devnode->dev);
mutex_unlock(&media_devnode_lock);
device_del(&devnode->dev);
devnode->media_dev = NULL;
put_device(&devnode->dev);
}