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vt(4): Don't recalculate buffer size if we don't know screen size

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When the screen size is unknown, it's set to 0x0. We can't use that as
the buffer size, otherwise, functions such as vtbuf_fill() will fail.

This fixes a panic on RaspberryPi, where there's no vt(4) backend
configured early in boot.

PR:		193981
Tested by:	danilo@
MFC after:	3 days
This commit is contained in:
Jean-Sébastien Pédron 2014-10-04 18:40:40 +00:00
parent b76278407d
commit 0d06446812
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272537
1 changed files with 2 additions and 1 deletions
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3
sys/dev/vt/vt_core.c
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@ -1269,7 +1269,8 @@ vtterm_cnprobe(struct terminal *tm, struct consdev *cp)
* that we have the real viewable size, fix it in the static
* buffer.
*/
vt_termsize(vd, vw->vw_font, &vw->vw_buf.vb_scr_size);
if (vd->vd_width != 0 && vd->vd_height != 0)
vt_termsize(vd, vw->vw_font, &vw->vw_buf.vb_scr_size);
vtbuf_init_early(&vw->vw_buf);
vt_winsize(vd, vw->vw_font, &wsz);