vb2_request_get_buf() returns the N-th buffer attached to a media
request.
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
Changes in v3:
* None
Changes in v2:
* Adjust the kernel doc as suggested by Hans
---
.../media/common/videobuf2/videobuf2-core.c | 23 +++++++++++++++++++
include/media/videobuf2-core.h | 11 +++++++++
2 files changed, 34 insertions(+)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 4489744fbbd9..c4c7980dcb0d 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1416,6 +1416,29 @@ unsigned int vb2_request_buffer_cnt(struct media_request *req)
}
EXPORT_SYMBOL_GPL(vb2_request_buffer_cnt);
+struct vb2_buffer *vb2_request_get_buf(struct media_request *req,
+ unsigned int n)
+{
+ struct media_request_object *obj;
+ struct vb2_buffer *buf = NULL;
+ unsigned int nbufs = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&req->lock, flags);
+ list_for_each_entry(obj, &req->objects, list) {
+ if (!vb2_request_object_is_buffer(obj) ||
+ nbufs++ < n)
+ continue;
+
+ buf = container_of(obj, struct vb2_buffer, req_obj);
+ break;
+ }
+ spin_unlock_irqrestore(&req->lock, flags);
+
+ return buf;
+}
+EXPORT_SYMBOL_GPL(vb2_request_get_buf);
+
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 a2b2208b02da..6206e25df764 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -1225,4 +1225,15 @@ bool vb2_request_object_is_buffer(struct media_request_object *obj);
*/
unsigned int vb2_request_buffer_cnt(struct media_request *req);
+/**
+ * vb2_request_get_buf() - return the buffer at index @idx
+ *
+ * @req: the request.
+ * @n: search for the Nth buffer in the req object list
+ *
+ * Return a vb2 buffer or NULL if there's no buffer at the specified position
+ */
+struct vb2_buffer *vb2_request_get_buf(struct media_request *req,
+ unsigned int n);
+
#endif /* _MEDIA_VIDEOBUF2_CORE_H */
--
2.23.0
