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authorweiping zhang <zhangweiping@didichuxing.com>2017-12-21 20:39:50 +0800
committerMichael S. Tsirkin <mst@redhat.com>2018-02-01 16:26:45 +0200
commitf2b44cde7e1687ef7886831a3a30df653bda2481 (patch)
treee09f617e1bcc15cf3bc5a14ce1d692af83d28471 /drivers/virtio
parentf6f93f75afb65997f4a84aaaab59dd06a4a06c80 (diff)
downloadlinux-f2b44cde7e1687ef7886831a3a30df653bda2481.tar.bz2
virtio: split device_register into device_initialize and device_add
In order to make caller do a simple cleanup, we split device_register into device_initialize and device_add. device_initialize always succeeds, so the caller can always use put_device when register_virtio_device faild. Signed-off-by: weiping zhang <zhangweiping@didichuxing.com> Suggested-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index bf7ff3934d7f..59e36ef4920f 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -303,11 +303,21 @@ void unregister_virtio_driver(struct virtio_driver *driver)
}
EXPORT_SYMBOL_GPL(unregister_virtio_driver);
+/**
+ * register_virtio_device - register virtio device
+ * @dev : virtio device to be registered
+ *
+ * On error, the caller must call put_device on &@dev->dev (and not kfree),
+ * as another code path may have obtained a reference to @dev.
+ *
+ * Returns: 0 on suceess, -error on failure
+ */
int register_virtio_device(struct virtio_device *dev)
{
int err;
dev->dev.bus = &virtio_bus;
+ device_initialize(&dev->dev);
/* Assign a unique device index and hence name. */
err = ida_simple_get(&virtio_index_ida, 0, 0, GFP_KERNEL);
@@ -330,9 +340,11 @@ int register_virtio_device(struct virtio_device *dev)
INIT_LIST_HEAD(&dev->vqs);
- /* device_register() causes the bus infrastructure to look for a
- * matching driver. */
- err = device_register(&dev->dev);
+ /*
+ * device_add() causes the bus infrastructure to look for a matching
+ * driver.
+ */
+ err = device_add(&dev->dev);
if (err)
ida_simple_remove(&virtio_index_ida, dev->index);
out: