[PATCH v2 1/1] v4l: subdev: Set sd->devnode before registering the subdev

[PATCH v2 1/1] v4l: subdev: Set sd->devnode before registering the subdev

[Sakari Ailus]

The subdev's video device node was only assigned after registering the
device node in the system. While it is unlikely that a driver needed to
use this field in handling system calls to its file handle, there remains
a slim chance the devnode field remains NULL while the driver expects to
find a video node there.

Assign the devnode field before registering the device, and assign it back
to NULL if the registration failed.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
I'm sending this separately from the rest of the serialisation set, after
a rebase, as it makes sense without it, too.

 drivers/media/v4l2-core/v4l2-device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index de4287251a89..d2e58ae91f9b 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -218,13 +218,14 @@ int __v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev,
 		vdev->ctrl_handler = sd->ctrl_handler;
 		if (read_only)
 			set_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
+		sd->devnode = vdev;
 		err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
 					      sd->owner);
 		if (err < 0) {
+			sd->devnode = NULL;
 			kfree(vdev);
 			goto clean_up;
 		}
-		sd->devnode = vdev;
 #if defined(CONFIG_MEDIA_CONTROLLER)
 		sd->entity.info.dev.major = VIDEO_MAJOR;
 		sd->entity.info.dev.minor = vdev->minor;
-- 
2.27.0