libcamera: pipeline: rkisp1: Add clear() to RkISP1Frames

When the camera is stopping the helper that keeps track of which buffers
are associated with a request is not cleared. Add a clear operation and
call it when the camera is stopped.

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

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -64,6 +64,7 @@ public:
 
 	RkISP1FrameInfo *create(unsigned int frame, Request *request, Stream *stream);
 	int destroy(unsigned int frame);
+	void clear();
 
 	RkISP1FrameInfo *find(unsigned int frame);
 	RkISP1FrameInfo *find(FrameBuffer *buffer);
@@ -279,6 +280,20 @@ int RkISP1Frames::destroy(unsigned int frame)
 	return 0;
 }
 
+void RkISP1Frames::clear()
+{
+	for (const auto &entry : frameInfo_) {
+		RkISP1FrameInfo *info = entry.second;
+
+		pipe_->availableParamBuffers_.push(info->paramBuffer);
+		pipe_->availableStatBuffers_.push(info->statBuffer);
+
+		delete info;
+	}
+
+	frameInfo_.clear();
+}
+
 RkISP1FrameInfo *RkISP1Frames::find(unsigned int frame)
 {
 	auto itInfo = frameInfo_.find(frame);
@@ -832,6 +847,8 @@ void PipelineHandlerRkISP1::stop(Camera *camera)
 
 	data->timeline_.reset();
 
+	data->frameInfo_.clear();
+
 	freeBuffers(camera);
 
 	activeCamera_ = nullptr;