From c28bf3c341aac660e14a11d590cd058daecd368e Mon Sep 17 00:00:00 2001
From: Volker Birk <vb@pep-project.org>
Date: Tue, 7 Jul 2020 10:12:11 +0200
Subject: [PATCH] don't lock unecessary

---
 passphrase_cache.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/passphrase_cache.cc b/passphrase_cache.cc
index aa26222..2aae276 100644
--- a/passphrase_cache.cc
+++ b/passphrase_cache.cc
@@ -34,9 +34,9 @@ namespace pEp {
 
     const char *PassphraseCache::add(const std::string& passphrase)
     {
-        std::lock_guard<std::mutex> lock(_mtx);
-
         if (!passphrase.empty()) {
+            std::lock_guard<std::mutex> lock(_mtx);
+
             while (_cache.size() >= _max_size)
                 _cache.pop_front();