From f3e9739ab0319818c9d14a2aa4ae40fc70516139 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beat=20K=C3=BCng?= <beat-kueng@gmx.net>
Date: Fri, 24 Mar 2017 17:00:27 +0100
Subject: [PATCH] param export: use writer lock

to protect against concurrent writes to the same file
---
 src/modules/systemlib/param/param.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/modules/systemlib/param/param.c b/src/modules/systemlib/param/param.c
index 0a0709cfe7..37ad429f85 100644
--- a/src/modules/systemlib/param/param.c
+++ b/src/modules/systemlib/param/param.c
@@ -1004,7 +1004,7 @@ param_export(int fd, bool only_unsaved)
 	struct bson_encoder_s encoder;
 	int	result = -1;
 
-	param_lock_reader();
+	param_lock_writer();
 
 	param_bus_lock(true);
 	bson_encoder_init_file(&encoder, fd);
@@ -1102,7 +1102,7 @@ param_export(int fd, bool only_unsaved)
 	result = 0;
 
 out:
-	param_unlock_reader();
+	param_unlock_writer();
 
 	if (result == 0) {
 		result = bson_encoder_fini(&encoder);