helpers: backend_device: Dequeue the config buffer after job completion

naushir · naushir · commit 6eb091e391e5 · 2025-09-30T13:45:06.000+01:00
The config buffer might be re-queued after job completion, so dequeue it
to avoid an IOCTL failure.

Signed-off-by: Naushir Patuck &lt;naush@raspberrypi.com&gt;
diff --git 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();
 

Original file line number	Diff line number	Diff line change
`@@ -138,6 +138,10 @@ int BackendDevice::Run(const std::map<std::string, V4l2Device::Buffer> &buffers)`
`138`	`138`	`ret = -1;`
`139`	`139`	`}`
`140`	`140`
	`141`	`+ // Must dequeue the config buffer in case it's used again.`
	`142`	`+ if (nodes_.at("pispbe-config").DequeueBuffer(1000) < 0)`
	`143`	`+ ret = -1;`
	`144`	`+`
`141`	`145`	`for (auto const &n : nodes_enabled_)`
`142`	`146`	`nodes_.at(n).StreamOff();`
`143`	`147`