Zebediah Figura : strmbase: Don't drop csRenderLock in BaseRenderer_Receive().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6f05c692107b35681944d6ef5c6cf7c1c057a97d
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6f05c692107b35681944d6ef5c6cf7c1c057a97d

Author: Zebediah Figura <z.figura12 at gmail.com>
Date:   Mon Nov 30 23:51:35 2020 -0600

strmbase: Don't drop csRenderLock in BaseRenderer_Receive().

We don't grab stream_cs to change any variables checked here, except to reset
flush_event, and that cannot result in a deadlock.

The only possible deadlocks here are:

(1) between this function and EndOfStream(), which is correct, as the two
    should presumably be serialized;

(2) between this function and EndFlush(); however, in that case we expect
    BeginFlush() first, which will unblock the streaming thread.

Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/strmbase/renderer.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/dlls/strmbase/renderer.c b/dlls/strmbase/renderer.c
index dde56b7a346..24d209703ca 100644
--- a/dlls/strmbase/renderer.c
+++ b/dlls/strmbase/renderer.c
@@ -224,18 +224,15 @@ static HRESULT WINAPI BaseRenderer_Receive(struct strmbase_sink *pin, IMediaSamp
             IReferenceClock_AdviseTime(filter->filter.clock, filter->stream_start,
                     start, (HEVENT)filter->advise_event, &cookie);
 
-            LeaveCriticalSection(&filter->csRenderLock);
-
             ret = WaitForMultipleObjects(2, handles, FALSE, INFINITE);
             IReferenceClock_Unadvise(filter->filter.clock, cookie);
 
             if (ret == 1)
             {
+                LeaveCriticalSection(&filter->csRenderLock);
                 TRACE("Flush signaled; discarding current sample.\n");
                 return S_OK;
             }
-
-            EnterCriticalSection(&filter->csRenderLock);
         }
     }