From 776008da69fad8b776c93b42b19426c7ae43f326 Mon Sep 17 00:00:00 2001
From: emersion <contact@emersion.fr>
Date: Sun, 7 Oct 2018 12:59:00 +0200
Subject: [PATCH] backend/drm: properly handle GPUs without CRTCs

---
 backend/drm/drm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index b9ab7f82..19dad63d 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -156,6 +156,11 @@ bool init_drm_resources(struct wlr_drm_backend *drm) {
 	wlr_log(WLR_INFO, "Found %d DRM CRTCs", res->count_crtcs);
 
 	drm->num_crtcs = res->count_crtcs;
+	if (drm->num_crtcs == 0) {
+		drmModeFreeResources(res);
+		return true;
+	}
+
 	drm->crtcs = calloc(drm->num_crtcs, sizeof(drm->crtcs[0]));
 	if (!drm->crtcs) {
 		wlr_log_errno(WLR_ERROR, "Allocation failed");