From 64f1359bd08060ffe7a5689fdcbaeec6d8a59980 Mon Sep 17 00:00:00 2001 From: Dongwon Kim Date: Fri, 21 Oct 2022 12:23:15 -0700 Subject: ui/gtk: prevent ui lock up when dpy_gl_update called again before current draw event occurs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A warning, "qemu: warning: console: no gl-unblock within" followed by guest scanout lockup can happen if dpy_gl_update is called in a row and the second call is made before gd_draw_event scheduled by the first call is taking place. This is because draw call returns without decrementing gl_block ref count if the dmabuf was already submitted as shown below. (gd_gl_area_draw/gd_egl_draw) if (dmabuf) { if (!dmabuf->draw_submitted) { return; } else { dmabuf->draw_submitted = false; } } So it should not schedule any redundant draw event in case draw_submitted is already set in gd_egl_fluch/gd_gl_area_scanout_flush. Cc: Gerd Hoffmann Cc: Vivek Kasireddy Signed-off-by: Dongwon Kim Reviewed-by: Marc-André Lureau Message-Id: <20221021192315.9110-1-dongwon.kim@intel.com> Signed-off-by: Gerd Hoffmann --- ui/gtk-gl-area.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'ui/gtk-gl-area.c') diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c index 682638a197..7696df1f6b 100644 --- a/ui/gtk-gl-area.c +++ b/ui/gtk-gl-area.c @@ -278,7 +278,7 @@ void gd_gl_area_scanout_flush(DisplayChangeListener *dcl, { VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl); - if (vc->gfx.guest_fb.dmabuf) { + if (vc->gfx.guest_fb.dmabuf && !vc->gfx.guest_fb.dmabuf->draw_submitted) { graphic_hw_gl_block(vc->gfx.dcl.con, true); vc->gfx.guest_fb.dmabuf->draw_submitted = true; } -- cgit v1.2.3