[PATCH 4/5] camera: Use invokeMethod() for pipe_->acquire() and pipe_->release()

[Hans de Goede]

Some pipeline handlers may want to open / close /dev/video# nodes
from pipe_->acquireDevices() / pipe_->releaseDevices().

V4L2VideoDevice::open() creates an EventNotifier, this notifier needs
to be created from the CameraManager thread.

Use invokeMethod() for pipe_->acquire() and pipe_->release() so that
any EventNotifiers created are created from the CameraManager thread
context.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 src/libcamera/camera.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp
index 4e393f89..61925e83 100644
--- a/src/libcamera/camera.cpp
+++ b/src/libcamera/camera.cpp
@@ -995,7 +995,8 @@ int Camera::acquire()
 	if (ret < 0)
 		return ret == -EACCES ? -EBUSY : ret;
 
-	if (!d->pipe_->acquire(this)) {
+	if (!d->pipe_->invokeMethod(&PipelineHandler::acquire,
+				    ConnectionTypeBlocking, this)) {
 		LOG(Camera, Info)
 			<< "Pipeline handler in use by another process";
 		return -EBUSY;
@@ -1030,7 +1031,8 @@ int Camera::release()
 		return ret == -EACCES ? -EBUSY : ret;
 
 	if (d->isAcquired())
-		d->pipe_->release(this);
+		d->pipe_->invokeMethod(&PipelineHandler::release,
+				       ConnectionTypeBlocking, this);
 
 	d->setState(Private::CameraAvailable);
 
-- 
2.46.0