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authorLogan Gunthorpe <logang@deltatee.com>2017-03-17 12:48:10 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-21 06:44:32 +0100
commit92a3fa075d3d2716b9c662814540f1d660cbf2f5 (patch)
treed301f0b5b8a991f7b7e4f8c6c3cb5283f581cca7
parented01e50acdd3e4a640cf9ebd28a7e810c3ceca97 (diff)
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>
-rw-r--r--drivers/dax/dax.c18
1 files changed, 5 insertions, 13 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index a5ed59a5a968..e5f85550dc25 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -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: