On 8/5/19 6:48 AM, Boris Brezillon wrote:
vb2_request_get_buf() returns the N-th buffer attached to a media
request.
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
.../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..58769f0c8665 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 idx)
+{
+ 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++ < idx)
+ 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 640aabe69450..febf3261a120 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -1222,4 +1222,15 @@ 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.
+ * @idx: index of the buffer in the req object list
This is confusing: it suggests that you are talking about the buffer
index itself (buf->index) instead of the nth buffer in the request.
Looks good otherwise.
Regards,
Hans
+ *
+ * Return a vb2 buffer or NULL if there's no buffer at the specified index
+ */
+struct vb2_buffer *vb2_request_get_buf(struct media_request *req,
+ unsigned int idx);
+
#endif /* _MEDIA_VIDEOBUF2_CORE_H */
