[plasma/kwin] src: wayland_server: also update the drm device of linux_drm_syncobj_v1

Git commit 212915b84daaebef22e6352b16eeb0399192218d by Xaver Hugl.
Committed on 14/08/2026 at 17:34.
Pushed by zamundaaa into branch 'master'.

wayland_server: also update the drm device of linux_drm_syncobj_v1

Otherwise importing syncobj will fail after the drm device in question
was hot-unplugged.

M  +5    -0    src/wayland/linux_drm_syncobj_v1.cpp
M  +2    -1    src/wayland/linux_drm_syncobj_v1.h
M  +3    -1    src/wayland_server.cpp

https://invent.kde.org/plasma/kwin/-/commit/212915b84daaebef22e6352b16eeb0399192218d

diff --git a/src/wayland/linux_drm_syncobj_v1.cpp b/src/wayland/linux_drm_syncobj_v1.cpp
index e1bdeb4a4d6..51c403df2e9 100644
--- a/src/wayland/linux_drm_syncobj_v1.cpp
+++ b/src/wayland/linux_drm_syncobj_v1.cpp
@@ -62,6 +62,11 @@ void LinuxDrmSyncObjV1Interface::wp_linux_drm_syncobj_manager_v1_destroy(Resourc
     wl_resource_destroy(resource->handle);
 }
 
+void LinuxDrmSyncObjV1Interface::setDrmDevice(DrmDevice *drmDevice)
+{
+    m_drmDevice = drmDevice;
+}
+
 void LinuxDrmSyncObjV1Interface::remove()
 {
     QtWaylandServer::wp_linux_drm_syncobj_manager_v1::globalRemove();
diff --git a/src/wayland/linux_drm_syncobj_v1.h b/src/wayland/linux_drm_syncobj_v1.h
index 20af774e046..cbb5d8fa69e 100644
--- a/src/wayland/linux_drm_syncobj_v1.h
+++ b/src/wayland/linux_drm_syncobj_v1.h
@@ -30,6 +30,7 @@ class KWIN_EXPORT LinuxDrmSyncObjV1Interface : public QObject, private QtWayland
 public:
     explicit LinuxDrmSyncObjV1Interface(Display *display, QObject *parent, DrmDevice *drmDevice);
 
+    void setDrmDevice(DrmDevice *drmDevice);
     void remove();
 
 private:
@@ -38,7 +39,7 @@ private:
     void wp_linux_drm_syncobj_manager_v1_destroy(Resource *resource) override;
     void wp_linux_drm_syncobj_manager_v1_destroy_global() override;
 
-    DrmDevice *const m_drmDevice;
+    DrmDevice *m_drmDevice;
 };
 
 class LinuxDrmSyncObjSurfaceV1 : private QtWaylandServer::wp_linux_drm_syncobj_surface_v1
diff --git a/src/wayland_server.cpp b/src/wayland_server.cpp
index dd92238c68a..910ef28fe8f 100644
--- a/src/wayland_server.cpp
+++ b/src/wayland_server.cpp
@@ -840,7 +840,9 @@ void WaylandServer::updateSyncobjSupport()
         if (linuxVersion.majorVersion() == 6 && (linuxVersion.minorVersion() == 7 || (linuxVersion.minorVersion() == 6 && linuxVersion.patchVersion() < 19))) {
             return;
         }
-        if (!m_linuxDrmSyncObj) {
+        if (m_linuxDrmSyncObj) {
+            m_linuxDrmSyncObj->setDrmDevice((*it)->drmDevice());
+        } else {
             m_linuxDrmSyncObj = new LinuxDrmSyncObjV1Interface(m_display, m_display, (*it)->drmDevice());
         }
     } else if (m_linuxDrmSyncObj) {