[PATCH 09/10] ntoskrnl.exe: Improve unsafe fast-mutex functions.

[Derek Lesho]

Signed-off-by: Derek Lesho 
---
 dlls/ntoskrnl.exe/sync.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index 3085543727..bb2d318e56 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/dlls/ntoskrnl.exe/sync.c
@@ -668,13 +668,12 @@ PSLIST_ENTRY WINAPI NTOSKRNL_ExInterlockedPushEntrySList( PSLIST_HEADER list, PS
 DEFINE_FASTCALL1_WRAPPER(ExAcquireFastMutexUnsafe)
 void WINAPI ExAcquireFastMutexUnsafe( FAST_MUTEX *mutex )
 {
-    LONG count;
-
     TRACE("mutex %p.\n", mutex);

-    count = InterlockedDecrement( &mutex->Count );
-    if (count < 0)
+    if (InterlockedDecrement(&mutex->Count) < 0)
         KeWaitForSingleObject( &mutex->Event, Executive, KernelMode, FALSE, NULL );
+
+    mutex->Owner = KeGetCurrentThread();
 }

/***********************************************************************
@@ -683,11 +682,10 @@ void WINAPI ExAcquireFastMutexUnsafe( FAST_MUTEX *mutex )
 DEFINE_FASTCALL1_WRAPPER(ExReleaseFastMutexUnsafe)
 void WINAPI ExReleaseFastMutexUnsafe( FAST_MUTEX *mutex )
 {
-    LONG count;
-
     TRACE("mutex %p.\n", mutex);

-    count = InterlockedIncrement( &mutex->Count );
-    if (count < 1)
+    mutex->Owner = NULL;
+
+    if (InterlockedIncrement(&mutex->Count) < 1)
         KeSetEvent( &mutex->Event, IO_NO_INCREMENT, FALSE );
 }