The video device depends on the existence of its media device --- if there
is one. Acquire a reference to it.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-dev.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index e6da353..cda04ff 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -171,6 +171,9 @@ static void v4l2_device_release(struct device *cd)
{
struct video_device *vdev = to_video_device(cd);
struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
+#ifdef CONFIG_MEDIA_CONTROLLER
+ struct media_device *mdev = v4l2_dev->mdev;
+#endif
mutex_lock(&videodev_lock);
if (WARN_ON(video_device[vdev->minor] != vdev)) {
@@ -193,8 +196,8 @@ static void v4l2_device_release(struct device *cd)
mutex_unlock(&videodev_lock);
-#if defined(CONFIG_MEDIA_CONTROLLER)
- if (v4l2_dev->mdev) {
+#ifdef CONFIG_MEDIA_CONTROLLER
+ if (mdev) {
/* Remove interfaces and interface links */
media_devnode_remove(vdev->intf_devnode);
if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
@@ -220,6 +223,11 @@ static void v4l2_device_release(struct device *cd)
/* Decrease v4l2_device refcount */
if (v4l2_dev)
v4l2_device_put(v4l2_dev);
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+ if (mdev)
+ media_device_put(mdev);
+#endif
}
static struct class video_class = {
@@ -808,6 +816,7 @@ static int video_register_media_controller(struct video_device *vdev, int type)
/* FIXME: how to create the other interface links? */
+ media_device_get(vdev->v4l2_dev->mdev);
#endif
return 0;
}
--
2.1.4
--
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