diff mbox series

[v3,13/26] media: mc: Initialise media devnode in media_device_init()

Message ID 20240312103422.216484-14-sakari.ailus@linux.intel.com
State Superseded
Headers show
Series [v3,01/26] Revert "[media] media: fix media devnode ioctl/syscall and unregister race" | expand

Commit Message

Sakari Ailus March 12, 2024, 10:34 a.m. UTC 
Call media_devnode_init() from media_device_init(). This has the effect of
creating a struct device for the media_devnode before it is registered,
making it possible to obtain a reference to it for e.g. video devices.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/media/mc/mc-device.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/mc/mc-device.c b/drivers/media/mc/mc-device.c
index f1f3addf7932..f1d89d940fe1 100644
--- a/drivers/media/mc/mc-device.c
+++ b/drivers/media/mc/mc-device.c
@@ -711,9 +711,10 @@  void media_device_init(struct media_device *mdev)
 	mutex_init(&mdev->req_queue_mutex);
 	mutex_init(&mdev->graph_mutex);
 	ida_init(&mdev->entity_internal_idx);
-
 	atomic_set(&mdev->request_id, 0);
 
+	media_devnode_init(&mdev->devnode);
+
 	if (!*mdev->bus_info)
 		media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info),
 				   mdev->dev);
@@ -729,6 +730,7 @@  void media_device_cleanup(struct media_device *mdev)
 	media_graph_walk_cleanup(&mdev->pm_count_walk);
 	mutex_destroy(&mdev->graph_mutex);
 	mutex_destroy(&mdev->req_queue_mutex);
+	put_device(&mdev->devnode.dev);
 }
 EXPORT_SYMBOL_GPL(media_device_cleanup);
 
@@ -744,26 +746,19 @@  int __must_check __media_device_register(struct media_device *mdev,
 	/* Set version 0 to indicate user-space that the graph is static */
 	mdev->topology_version = 0;
 
-	media_devnode_init(&mdev->devnode);
-
 	ret = media_devnode_register(&mdev->devnode, owner);
 	if (ret < 0)
-		goto err_put;
+		return ret;
 
 	ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
-	if (ret < 0)
-		goto err_unregister;
+	if (ret < 0) {
+		media_devnode_unregister(&mdev->devnode);
+		return ret;
+	}
 
 	dev_dbg(mdev->dev, "Media device registered\n");
 
 	return 0;
-
-err_unregister:
-	media_devnode_unregister(&mdev->devnode);
-err_put:
-	put_device(&mdev->devnode.dev);
-
-	return ret;
 }
 EXPORT_SYMBOL_GPL(__media_device_register);
 
@@ -810,7 +805,6 @@  void media_device_unregister(struct media_device *mdev)
 	device_remove_file(&mdev->devnode.dev, &dev_attr_model);
 	dev_dbg(mdev->dev, "Media device unregistering\n");
 	media_devnode_unregister(&mdev->devnode);
-	put_device(&mdev->devnode.dev);
 }
 EXPORT_SYMBOL_GPL(media_device_unregister);