[RFC PATCHv2 06/11] videobuf2-core: add vb2_request_buffer_first()

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Add the vb2_request_buffer_first() helper function to obtain the
first vb2 buffer in the request.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
---
 .../media/common/videobuf2/videobuf2-core.c   | 19 +++++++++++++++++++
 include/media/videobuf2-core.h                |  7 +++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 10c552638878..3157fefe6500 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1477,6 +1477,25 @@ unsigned int vb2_request_buffer_cnt(struct media_request *req)
 }
 EXPORT_SYMBOL_GPL(vb2_request_buffer_cnt);
 
+struct vb2_buffer *vb2_request_buffer_first(struct media_request *req)
+{
+	struct media_request_object *obj;
+	struct vb2_buffer *vb = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&req->lock, flags);
+	list_for_each_entry(obj, &req->objects, list) {
+		if (vb2_request_object_is_buffer(obj)) {
+			vb = container_of(obj, struct vb2_buffer, req_obj);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&req->lock, flags);
+
+	return vb;
+}
+EXPORT_SYMBOL_GPL(vb2_request_buffer_first);
+
 int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
 {
 	struct vb2_buffer *vb;
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 0760f967365a..f508ce6b3152 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -1258,4 +1258,11 @@ bool vb2_request_object_is_buffer(struct media_request_object *obj);
  */
 unsigned int vb2_request_buffer_cnt(struct media_request *req);
 
+/**
+ * vb2_request_buffer_first() - return the first buffer in the request
+ *
+ * @req:	the request.
+ */
+struct vb2_buffer *vb2_request_buffer_first(struct media_request *req);
+
 #endif /* _MEDIA_VIDEOBUF2_CORE_H */
-- 
2.30.2




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