[RFC v2 07/17] media: Split initialisation and adding device

[Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>]

As registering a device node of an entity belonging to a media device
will require a reference to the struct device. Taking that reference is
only possible once the device has been initialised, which took place only
when it was registered. Split this in two, and initialise the device when
the media device is allocated.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
 drivers/media/media-device.c          |  1 +
 drivers/media/media-devnode.c         | 15 ++++++++++-----
 drivers/media/platform/omap3isp/isp.c |  4 +++-
 include/media/media-devnode.h         | 15 +++++++++++----
 4 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 5a86d36..d527491 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -707,6 +707,7 @@ struct media_device *media_device_alloc(void)
 	if (!mdev)
 		return NULL;
 
+	media_devnode_init(&mdev->devnode);
 	media_device_init(mdev);
 
 	return mdev;
diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 7481c96..aa8030b 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -219,6 +219,11 @@ static const struct file_operations media_devnode_fops = {
 	.llseek = no_llseek,
 };
 
+void media_devnode_init(struct media_devnode *devnode)
+{
+	device_initialize(&devnode->dev);
+}
+
 int __must_check media_devnode_register(struct media_devnode *devnode,
 					struct module *owner)
 {
@@ -256,7 +261,7 @@ int __must_check media_devnode_register(struct media_devnode *devnode,
 	if (devnode->parent)
 		devnode->dev.parent = devnode->parent;
 	dev_set_name(&devnode->dev, "media%d", devnode->minor);
-	ret = device_register(&devnode->dev);
+	ret = device_add(&devnode->dev);
 	if (ret < 0) {
 		pr_err("%s: device_register failed\n", __func__);
 		goto error;
@@ -291,7 +296,7 @@ void media_devnode_unregister(struct media_devnode *devnode)
 /*
  *	Initialise media for linux
  */
-static int __init media_devnode_init(void)
+static int __init media_devnode_module_init(void)
 {
 	int ret;
 
@@ -313,14 +318,14 @@ static int __init media_devnode_init(void)
 	return 0;
 }
 
-static void __exit media_devnode_exit(void)
+static void __exit media_devnode_module_exit(void)
 {
 	bus_unregister(&media_bus_type);
 	unregister_chrdev_region(media_dev_t, MEDIA_NUM_DEVICES);
 }
 
-subsys_initcall(media_devnode_init);
-module_exit(media_devnode_exit)
+subsys_initcall(media_devnode_module_init);
+module_exit(media_devnode_module_exit)
 
 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>");
 MODULE_DESCRIPTION("Device node registration for media drivers");
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 5d54e2c..aa32537 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -1726,8 +1726,10 @@ static int isp_register_entities(struct isp_device *isp)
 		goto done;
 
 done:
-	if (ret < 0)
+	if (ret < 0) {
 		isp_unregister_entities(isp);
+		media_device_put(&isp->media_dev);
+	}
 
 	return ret;
 }
diff --git a/include/media/media-devnode.h b/include/media/media-devnode.h
index a0f6823..5253a4b 100644
--- a/include/media/media-devnode.h
+++ b/include/media/media-devnode.h
@@ -102,6 +102,17 @@ struct media_devnode {
 #define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
 
 /**
+ * media_devnode_init - initialise a media devnode
+ *
+ * @devnode: struct media_devnode we want to initialise
+ *
+ * Initialise a media devnode. Note that after initialising the media
+ * devnode is refcounted. Releaseing references to it may be done
+ * using put_device.
+ */
+void media_devnode_init(struct media_devnode *devnode);
+
+/**
  * media_devnode_register - register a media device node
  *
  * @devnode: struct media_devnode we want to register a device node
@@ -112,10 +123,6 @@ struct media_devnode {
  * or if the registration of the device node fails.
  *
  * Zero is returned on success.
- *
- * Note that if the media_devnode_register call fails, the release() callback of
- * the media_devnode structure is *not* called, so the caller is responsible for
- * freeing any data.
  */
 int __must_check media_devnode_register(struct media_devnode *devnode,
 					struct module *owner);
-- 
2.1.4

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