From 6eb091e391e519178fb1baf63cb163355420ebdd Mon Sep 17 00:00:00 2001
From: Naushir Patuck <naush@raspberrypi.com>
Date: Tue, 30 Sep 2025 13:43:56 +0100
Subject: [PATCH] helpers: backend_device: Dequeue the config buffer after job
 completion

The config buffer might be re-queued after job completion, so dequeue it
to avoid an IOCTL failure.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
---
 src/helpers/backend_device.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/helpers/backend_device.cpp b/src/helpers/backend_device.cpp
index 5647d77..4c638e7 100644
--- a/src/helpers/backend_device.cpp
+++ b/src/helpers/backend_device.cpp
@@ -138,6 +138,10 @@ int BackendDevice::Run(const std::map<std::string, V4l2Device::Buffer> &buffers)
 			ret = -1;
 	}
 
+	// Must dequeue the config buffer in case it's used again.
+	if (nodes_.at("pispbe-config").DequeueBuffer(1000) < 0)
+		ret = -1;
+
 	for (auto const &n : nodes_enabled_)
 		nodes_.at(n).StreamOff();