From 2fc324734371b2eac7f7f34aedf4715febd65eb6 Mon Sep 17 00:00:00 2001
From: Dean Lee <deanlee3@gmail.com>
Date: Tue, 14 Apr 2020 06:09:48 +0800
Subject: [PATCH] close file descriptor (#1353)

* close file descriptor

* check return value
---
 selfdrive/common/framebuffer.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/selfdrive/common/framebuffer.cc b/selfdrive/common/framebuffer.cc
index 788b812997..7bea565d59 100644
--- a/selfdrive/common/framebuffer.cc
+++ b/selfdrive/common/framebuffer.cc
@@ -126,8 +126,11 @@ extern "C" FramebufferState* framebuffer_init(
 
   // set brightness
   int brightness_fd = open(BACKLIGHT_CONTROL, O_RDWR);
-  const char brightness_level[] = BACKLIGHT_LEVEL;
-  write(brightness_fd, brightness_level, strlen(brightness_level));
+  if (brightness_fd != -1){
+    const char brightness_level[] = BACKLIGHT_LEVEL;
+    write(brightness_fd, brightness_level, strlen(brightness_level));
+    close(brightness_fd);
+  }
 
   if (out_w) *out_w = w;
   if (out_h) *out_h = h;