From 287428271dd5329c9d84758c43fa350033818a3e Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Sat, 3 Aug 2019 20:31:41 -0400
Subject: [PATCH] kernel/condition_variable: Acquire and release locks in the
 right order.

Should fix #15223.
---
 src/system/kernel/condition_variable.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/system/kernel/condition_variable.cpp b/src/system/kernel/condition_variable.cpp
index 16ac6b809c..c33882e329 100644
--- a/src/system/kernel/condition_variable.cpp
+++ b/src/system/kernel/condition_variable.cpp
@@ -325,11 +325,12 @@ ConditionVariable::_NotifyLocked(bool all, status_t result)
 	// entering Wait() and acquiring its own lock, and then acquiring ours.
 	while (ConditionVariableEntry* entry = fEntries.RemoveHead()) {
 		release_spinlock(&fLock);
+		acquire_spinlock(&entry->fLock);
 
-		SpinLocker _(entry->fLock);
 		entry->fVariable = NULL;
 
 		if (entry->fWaitStatus <= 0) {
+			release_spinlock(&entry->fLock);
 			acquire_spinlock(&fLock);
 			continue;
 		}
@@ -341,6 +342,7 @@ ConditionVariable::_NotifyLocked(bool all, status_t result)
 
 		entry->fWaitStatus = result;
 
+		release_spinlock(&entry->fLock);
 		acquire_spinlock(&fLock);
 
 		if (!all)