From 376e57ee7b8223a77a4c63dc1198bf1a875b4a31 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Fri, 6 Dec 2019 16:28:03 +0100
Subject: vo_drm: fix potentially broken capability check

If the capability is available it may still be 0 to signal absence of support.
---
 video/out/vo_drm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/video/out/vo_drm.c b/video/out/vo_drm.c
index 61722213ad..be5b0c52d9 100644
--- a/video/out/vo_drm.c
+++ b/video/out/vo_drm.c
@@ -590,8 +590,9 @@ static int preinit(struct vo *vo)
         goto err;
     }
 
-    uint64_t has_dumb;
-    if (drmGetCap(p->kms->fd, DRM_CAP_DUMB_BUFFER, &has_dumb) < 0) {
+    uint64_t has_dumb = 0;
+    if (drmGetCap(p->kms->fd, DRM_CAP_DUMB_BUFFER, &has_dumb) < 0
+        || has_dumb == 0) {
         MP_ERR(vo, "Card \"%d\" does not support dumb buffers.\n",
                p->kms->card_no);
         goto err;
-- 
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