From 9622d8acf15601a700cc233659b627a8ac987dfa Mon Sep 17 00:00:00 2001
From: macallan <macallan@NetBSD.org>
Date: Tue, 13 Nov 2012 20:29:03 +0000
Subject: [PATCH] glyphcache_init(): bail if we don't have enough off-screen
 memory to be useful

---
 sys/dev/wscons/wsdisplay_glyphcache.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sys/dev/wscons/wsdisplay_glyphcache.c b/sys/dev/wscons/wsdisplay_glyphcache.c
index 0a88f081ca7e..0d89a76515fe 100644
--- a/sys/dev/wscons/wsdisplay_glyphcache.c
+++ b/sys/dev/wscons/wsdisplay_glyphcache.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: wsdisplay_glyphcache.c,v 1.4 2012/10/04 10:26:32 macallan Exp $	*/
+/*	$NetBSD: wsdisplay_glyphcache.c,v 1.5 2012/11/13 20:29:03 macallan Exp $	*/
 
 /*
  * Copyright (c) 2012 Michael Lorenz
@@ -75,6 +75,14 @@ glyphcache_init(glyphcache *gc, int first, int lines, int width,
 	buckets = (gc->gc_numcells / 223);
 	if ((buckets * 223) < gc->gc_numcells)
 		buckets++;
+
+	/*
+	 * if we don't have enough video memory to cache at least a few glyphs
+	 * we stop right here
+	 */
+	if (buckets < 1)
+		return ENOMEM;
+
 	gc->gc_buckets = kmem_alloc(sizeof(gc_bucket) * buckets, KM_SLEEP);
 	if (gc->gc_buckets == NULL) {
 		aprint_error("%s: can't allocate memory\n", __func__);