From b35ad5b523ec8fcb2f247c1c6700af2a244115b7 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 14 Sep 2019 19:35:07 +0200
Subject: [PATCH] Kernel: Fix bad assertion in Lock::unlock_if_locked()

We shouldn't assert if you call this on a Lock held by another Thread
in the same Process. Instead, we should just not unlock.
---
 Kernel/Lock.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Kernel/Lock.cpp b/Kernel/Lock.cpp
index c19f479f640..73446853072 100644
--- a/Kernel/Lock.cpp
+++ b/Kernel/Lock.cpp
@@ -49,11 +49,13 @@ bool Lock::unlock_if_locked()
     for (;;) {
         if (CAS(&m_lock, 1, 0) == 0) {
             if (m_level == 0) {
-                memory_barrier();
                 m_lock = 0;
                 return false;
             }
-            ASSERT(m_holder == current);
+            if (m_holder != current) {
+                m_lock = 0;
+                return false;
+            }
             ASSERT(m_level);
             --m_level;
             if (m_level) {