1 files changed, 11 insertions, 0 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 96d22215cc88..d00b9d3511f2 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -128,6 +128,7 @@ struct video_device
         const struct v4l2_ioctl_ops *ioctl_ops;
 
         /* serialization lock */
+        DECLARE_BITMAP(dont_use_lock, BASE_VIDIOC_PRIVATE);
         struct mutex *lock;
 };
 
@@ -173,6 +174,16 @@ void video_device_release(struct video_device *vdev);
    a dubious construction at best. */
 void video_device_release_empty(struct video_device *vdev);
 
+/* returns true if cmd is a known V4L2 ioctl */
+bool v4l2_is_known_ioctl(unsigned int cmd);
+
+/* mark that this command shouldn't use core locking */
+static inline void v4l2_dont_use_lock(struct video_device *vdev, unsigned int cmd)
+{
+        if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
+                set_bit(_IOC_NR(cmd), vdev->dont_use_lock);
+}
+
 /* helper functions to access driver private data. */
 static inline void *video_get_drvdata(struct video_device *vdev)
 {