1 files changed, 20 insertions, 1 deletions

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 22f3ff76a8b5..640aabe69450 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -54,7 +54,8 @@ struct vb2_threadio_data;
  *              will then be passed as @buf_priv argument to other ops in this
  *              structure. Additional gfp_flags to use when allocating the
  *              are also passed to this operation. These flags are from the
- *              gfp_flags field of vb2_queue.
+ *              gfp_flags field of vb2_queue. The size argument to this function
+ *              shall be *page aligned*.
  * @put:        inform the allocator that the buffer will no longer be used;
  *              usually will result in the allocator freeing the buffer (if
  *              no other users of this buffer are present); the @buf_priv
@@ -1162,6 +1163,24 @@ static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
         q->last_buffer_dequeued = false;
 }
 
+/**
+ * vb2_get_buffer() - get a buffer from a queue
+ * @q:          pointer to &struct vb2_queue with videobuf2 queue.
+ * @index:      buffer index
+ *
+ * This function obtains a buffer from a queue, by its index.
+ * Keep in mind that there is no refcounting involved in this
+ * operation, so the buffer lifetime should be taken into
+ * consideration.
+ */
+static inline struct vb2_buffer *vb2_get_buffer(struct vb2_queue *q,
+                                                unsigned int index)
+{
+        if (index < q->num_buffers)
+                return q->bufs[index];
+        return NULL;
+}
+
 /*
  * The following functions are not part of the vb2 core API, but are useful
  * functions for videobuf2-*.