Currently v4l2_device_register_subdev_nodes() does not initialize the
dev_parent field of the video_device structs it creates for subdevices
being registered. This leads to __video_register_device() falling back
to the parent device of associated v4l2_device struct, which often does
not match the physical device the subdevice is registered for.
Due to the problem above, the links between real devices and v4l-subdev
nodes cannot be obtained from sysfs, which might be confusing for the
userspace trying to identify the hardware.
Fix this by initializing the dev_parent field of the video_device struct
with the value of dev field of the v4l2_subdev struct. In case of
subdevices without a parent struct device, the field will be NULL and the
old behavior will be preserved by the semantics of
__video_register_device().
Signed-off-by: Tomasz Figa <[email protected]>
---
drivers/media/v4l2-core/v4l2-device.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index 937c6de85606..450c97caf2c6 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -246,6 +246,7 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
video_set_drvdata(vdev, sd);
strlcpy(vdev->name, sd->name, sizeof(vdev->name));
+ vdev->dev_parent = sd->dev;
vdev->v4l2_dev = v4l2_dev;
vdev->fops = &v4l2_subdev_fops;
vdev->release = v4l2_device_release_subdev_node;
--
2.15.1.504.g5279b80103-goog
On Fri, Dec 15, 2017 at 01:32:21PM +0900, Tomasz Figa wrote:
> Currently v4l2_device_register_subdev_nodes() does not initialize the
> dev_parent field of the video_device structs it creates for subdevices
> being registered. This leads to __video_register_device() falling back
> to the parent device of associated v4l2_device struct, which often does
> not match the physical device the subdevice is registered for.
>
> Due to the problem above, the links between real devices and v4l-subdev
> nodes cannot be obtained from sysfs, which might be confusing for the
> userspace trying to identify the hardware.
>
> Fix this by initializing the dev_parent field of the video_device struct
> with the value of dev field of the v4l2_subdev struct. In case of
> subdevices without a parent struct device, the field will be NULL and the
> old behavior will be preserved by the semantics of
> __video_register_device().
>
> Signed-off-by: Tomasz Figa <[email protected]>
Acked-by: Sakari Ailus <[email protected]>
--
Sakari Ailus
[email protected]