From 5d86800792769ec5d83762281226075ecd342426 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Tue, 11 Sep 2018 20:25:58 +0000
Subject: [PATCH] Only look for acpi tables if acpi(4) attached.  Fixes
 radeondrm(4) crash on arm64 when using a device tree.

---
 sys/dev/pci/drm/drm_linux.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/dev/pci/drm/drm_linux.c b/sys/dev/pci/drm/drm_linux.c
index f71aab59c23..635cf7fa008 100644
--- a/sys/dev/pci/drm/drm_linux.c
+++ b/sys/dev/pci/drm/drm_linux.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: drm_linux.c,v 1.31 2018/08/25 18:42:43 kettenis Exp $	*/
+/*	$OpenBSD: drm_linux.c,v 1.32 2018/09/11 20:25:58 kettenis Exp $	*/
 /*
  * Copyright (c) 2013 Jonathan Gray <jsg@openbsd.org>
  * Copyright (c) 2015, 2016 Mark Kettenis <kettenis@openbsd.org>
@@ -747,6 +747,9 @@ acpi_get_table_with_size(const char *sig, int instance,
 
 	KASSERT(instance == 1);
 
+	if (sc == NULL)
+		return AE_NOT_FOUND;
+
 	SIMPLEQ_FOREACH(entry, &sc->sc_tables, q_next) {
 		if (memcmp(entry->q_table, sig, strlen(sig)) == 0) {
 			*hdr = entry->q_table;
-- 
2.20.1