V4L/DVB: videobuf: add ext_lock argument to the queue init functions

Add an ext_lock argument to the videobuf init functions. This allows
drivers to pass the vdev->lock pointer (or any other externally held lock)
to videobuf. For now all drivers just pass NULL.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
index aa4ebb4..1c647e8 100644
--- a/include/media/videobuf-dma-sg.h
+++ b/include/media/videobuf-dma-sg.h
@@ -103,7 +103,8 @@
 			 enum v4l2_buf_type type,
 			 enum v4l2_field field,
 			 unsigned int msize,
-			 void *priv);
+			 void *priv,
+			 struct mutex *ext_lock);
 
 #endif /* _VIDEOBUF_DMA_SG_H */