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-rw-r--r--include/media/videobuf2-core.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 8d62a51cb7a0..2ffcb81aee9c 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -276,7 +276,15 @@ struct vb2_buffer {
* in driver; optional
* @buf_finish: called before every dequeue of the buffer back to
* userspace; drivers may perform any operations required
- * before userspace accesses the buffer; optional
+ * before userspace accesses the buffer; optional. The
+ * buffer state can be one of the following: DONE and
+ * ERROR occur while streaming is in progress, and the
+ * PREPARED state occurs when the queue has been canceled
+ * and all pending buffers are being returned to their
+ * default DEQUEUED state. Typically you only have to do
+ * something if the state is VB2_BUF_STATE_DONE, since in
+ * all other cases the buffer contents will be ignored
+ * anyway.
* @buf_cleanup: called once before the buffer is freed; drivers may
* perform any additional cleanup; optional
* @start_streaming: called once to enter 'streaming' state; the driver may

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