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MFC r273219: Do nothing in vt_upgrade if there is no vt driver

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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
This commit is contained in:
emaste 2014-10-20 01:01:55 +00:00
parent f22cd31080
commit ae8c60e6aa
1 changed files with 2 additions and 0 deletions
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2
sys/dev/vt/vt_core.c
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@ -2491,6 +2491,8 @@ 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];