From: Hans Verkuil <>

The mdev field is only present if CONFIG_MEDIA_CONTROLLER is set.
But since we will need to pass the media_device to vb2 snd the
control framework it is very convenient to just make this field
available all the time. If CONFIG_MEDIA_CONTROLLER is not set,
then it will just be NULL.

Signed-off-by: Hans Verkuil <>
 include/media/v4l2-device.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 0c9e4da55499..b330e4a08a6b 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -33,7 +33,7 @@ struct v4l2_ctrl_handler;
  * struct v4l2_device - main struct to for V4L2 device drivers
  * @dev: pointer to struct device.
- * @mdev: pointer to struct media_device
+ * @mdev: pointer to struct media_device, may be NULL.
  * @subdevs: used to keep track of the registered subdevs
  * @lock: lock this struct; can be used by the driver as well
  *     if this struct is embedded into a larger struct.
@@ -58,9 +58,7 @@ struct v4l2_ctrl_handler;
 struct v4l2_device {
        struct device *dev;
        struct media_device *mdev;
        struct list_head subdevs;
        spinlock_t lock;
        char name[V4L2_DEVICE_NAME_SIZE];

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