From 299a35d9431fbc5d0dc628bdee06ed84619b4974 Mon Sep 17 00:00:00 2001
From: Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
Date: Thu, 20 Jan 2022 14:47:49 +0100
Subject: [PATCH] libdrm/iris: check if VFS '<gpu/>' is present

On startup check if '/dev/gpu' is present and issue an error in case it
is not.

issue #4380
---
 repos/libports/src/lib/libdrm/ioctl_iris.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/repos/libports/src/lib/libdrm/ioctl_iris.cc b/repos/libports/src/lib/libdrm/ioctl_iris.cc
index dc8804f1f1..3e2122cf0d 100644
--- a/repos/libports/src/lib/libdrm/ioctl_iris.cc
+++ b/repos/libports/src/lib/libdrm/ioctl_iris.cc
@@ -1620,6 +1620,14 @@ static Genode::Constructible<Drm_call> _call;
 
 void drm_init()
 {
+	/* make sure VFS is initialized */
+	struct Libc::stat buf;
+	if (stat("/dev/gpu", &buf) < 0) {
+		Genode::error("'/dev/gpu' not accessible: ",
+				          "try configure '<gpu>' in 'dev' directory of VFS'");
+		return;
+	}
+
 	_call.construct();
 }