1 files changed, 5 insertions, 0 deletions

diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index dfd984f10d42..19e93523c2d8 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -304,6 +304,11 @@ extern int v4l2_video_std_construct(struct v4l2_standard *vs,
    then do printk(KERN_DEBUG "%s: ", prefix) first. */
 extern void v4l_printk_ioctl(const char *prefix, unsigned int cmd);
 
+/* Internal use only: get the mutex (if any) that we need to lock for the
+   given command. */
+struct video_device;
+extern struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev, unsigned cmd);
+
 /* names for fancy debug output */
 extern const char *v4l2_field_names[];
 extern const char *v4l2_type_names[];