libcamera: v4l2_videodevice: Signal buffer completion at streamoff time

When stopping the stream buffers have been queued, in which case their
completion is never be notified to the user. This can lead to memory
leaks. Fix it by notifying completion of all queued buffers with the
status set to error.

As a result the base PipelineHandler implementation can be simplified,
as all requests complete as the result of stopping the stream. The
stop() method that manually completes all queued requests isn't needed
anymore.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/libcamera/request.h b/include/libcamera/request.h
index f69b4e7a..9edf1ced 100644
--- a/include/libcamera/request.h
+++ b/include/libcamera/request.h
@@ -51,7 +51,7 @@ private:
 	friend class PipelineHandler;
 
 	int prepare();
-	void complete(Status status);
+	void complete();
 
 	bool completeBuffer(Buffer *buffer);
 
@@ -62,6 +62,7 @@ private:
 
 	const uint64_t cookie_;
 	Status status_;
+	bool cancelled_;
 };
 
 } /* namespace libcamera */