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path: root/drivers/media/v4l2-core/v4l2-device.c
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Diffstat (limited to 'drivers/media/v4l2-core/v4l2-device.c')
-rw-r--r--drivers/media/v4l2-core/v4l2-device.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index 8ed5da2170bf..02d1b6327117 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -44,7 +44,8 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
v4l2_dev->dev = dev;
if (dev == NULL) {
/* If dev == NULL, then name must be filled in by the caller */
- WARN_ON(!v4l2_dev->name[0]);
+ if (WARN_ON(!v4l2_dev->name[0]))
+ return -EINVAL;
return 0;
}
@@ -105,7 +106,9 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
{
struct v4l2_subdev *sd, *next;
- if (v4l2_dev == NULL)
+ /* Just return if v4l2_dev is NULL or if it was already
+ * unregistered before. */
+ if (v4l2_dev == NULL || !v4l2_dev->name[0])
return;
v4l2_device_disconnect(v4l2_dev);
@@ -135,6 +138,8 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
}
#endif
}
+ /* Mark as unregistered, thus preventing duplicate unregistrations */
+ v4l2_dev->name[0] = '\0';
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister);
@@ -269,8 +274,10 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
sd->v4l2_dev = NULL;
#if defined(CONFIG_MEDIA_CONTROLLER)
- if (v4l2_dev->mdev)
+ if (v4l2_dev->mdev) {
+ media_entity_remove_links(&sd->entity);
media_device_unregister_entity(&sd->entity);
+ }
#endif
video_unregister_device(sd->devnode);
module_put(sd->owner);