From 0e53ac55b70c7ac8e919f5fedc3b2a244193ddce Mon Sep 17 00:00:00 2001 From: Ed Maste Date: Fri, 17 Oct 2014 13:55:45 +0000 Subject: [PATCH] Do nothing in vt_upgrade if there is no vt driver Previously, if no drivers attached at boot we would panic with "vtbuf_fill_locked begin.tp_row 0 must be < screen height 0". PR: 192248 Reviewed by: ray MFC after: 3 days Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D954 --- sys/dev/vt/vt_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c index 487a7ce5aa0..854633efafd 100644 --- a/sys/dev/vt/vt_core.c +++ b/sys/dev/vt/vt_core.c @@ -2498,6 +2498,8 @@ vt_upgrade(struct vt_device *vd) if (!vty_enabled(VTY_VT)) return; + if (main_vd->vd_driver == NULL) + return; for (i = 0; i < VT_MAXWINDOWS; i++) { vw = vd->vd_windows[i];