[PATCH 2/3] ui/gtk: unblock pipeline only if fence hasn't been signaled yet

[Dongwon Kim <dongwon.kim@intel.com>]

It is needed to unblock the pipeline only if there is an active dmabuf
to be rendered and the fence for it is not yet signaled.

Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
 ui/gtk.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/ui/gtk.c b/ui/gtk.c
index ea8d07833e..073c9eadb8 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -597,10 +597,16 @@ void gd_hw_gl_flushed(void *vcon)
     VirtualConsole *vc = vcon;
     QemuDmaBuf *dmabuf = vc->gfx.guest_fb.dmabuf;
 
-    qemu_set_fd_handler(dmabuf->fence_fd, NULL, NULL, NULL);
-    close(dmabuf->fence_fd);
-    dmabuf->fence_fd = -1;
-    graphic_hw_gl_block(vc->gfx.dcl.con, false);
+    if (!dmabuf) {
+        return;
+    }
+
+    if (dmabuf->fence_fd > 0) {
+        qemu_set_fd_handler(dmabuf->fence_fd, NULL, NULL, NULL);
+        close(dmabuf->fence_fd);
+        dmabuf->fence_fd = -1;
+        graphic_hw_gl_block(vc->gfx.dcl.con, false);
+    }
 }
 
 /** DisplayState Callbacks (opengl version) **/
-- 
2.34.1