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device-dax: 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: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Logan Gunthorpe 2017-03-17 12:48:10 -06:00 committed by Greg Kroah-Hartman
parent ed01e50acd
commit 92a3fa075d
1 changed files with 5 additions and 13 deletions
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18
drivers/dax/dax.c
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@ -677,8 +677,6 @@ static void dax_dev_release(struct device *dev)
static void kill_dax_dev(struct dax_dev *dax_dev)
{
struct cdev *cdev = &dax_dev->cdev;
/*
* Note, rcu is not protecting the liveness of dax_dev, rcu is
* ensuring that any fault handlers that might have seen
@ -689,7 +687,6 @@ static void kill_dax_dev(struct dax_dev *dax_dev)
dax_dev->alive = false;
synchronize_rcu();
unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
cdev_del(cdev);
}
static void unregister_dax_dev(void *dev)
@ -699,7 +696,8 @@ static void unregister_dax_dev(void *dev)
dev_dbg(dev, "%s\n", __func__);
kill_dax_dev(dax_dev);
device_unregister(dev);
cdev_device_del(&dax_dev->cdev, dev);
put_device(dev);
}
struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
@ -750,18 +748,13 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
goto err_inode;
}
/* device_initialize() so cdev can reference kobj parent */
/* from here on we're committed to teardown via dax_dev_release() */
device_initialize(dev);
cdev = &dax_dev->cdev;
cdev_init(cdev, &dax_fops);
cdev->owner = parent->driver->owner;
cdev->kobj.parent = &dev->kobj;
rc = cdev_add(&dax_dev->cdev, dev_t, 1);
if (rc)
goto err_cdev;
/* from here on we're committed to teardown via dax_dev_release() */
dax_dev->num_resources = count;
dax_dev->alive = true;
dax_dev->region = dax_region;
@ -773,7 +766,8 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
dev->groups = dax_attribute_groups;
dev->release = dax_dev_release;
dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
rc = device_add(dev);
rc = cdev_device_add(cdev, dev);
if (rc) {
kill_dax_dev(dax_dev);
put_device(dev);
@ -786,8 +780,6 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
return dax_dev;
err_cdev:
iput(dax_dev->inode);
err_inode:
ida_simple_remove(&dax_minor_ida, minor);
err_minor: