If running with a software renderer backend, the timeout may be insufficient, and we don't want to release busy buffers too early. In practice, SVGA gpu lockups are extremely rare. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com> Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org>