From: Randell Jesup <rjesup@mozilla.com>
Date: Wed, 17 Apr 2024 21:10:00 +0000
Subject: Bug 1892045: Quiet a thread-safety warning by taking a mutex in v4l2
 capture r=webrtc-reviewers,pehrsons

Just to make the analyzer happy, no risk here

Differential Revision: https://phabricator.services.mozilla.com/D207758
Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/0b54a6f17243e15da4609bc82afc92afcc4ac6de
---
 modules/video_capture/linux/video_capture_v4l2.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/video_capture/linux/video_capture_v4l2.cc b/modules/video_capture/linux/video_capture_v4l2.cc
index db2450a2c7..e3bdcd5953 100644
--- a/modules/video_capture/linux/video_capture_v4l2.cc
+++ b/modules/video_capture/linux/video_capture_v4l2.cc
@@ -303,7 +303,12 @@ int32_t VideoCaptureModuleV4L2::StartCapture(
 
   // start capture thread;
   if (_captureThread.empty()) {
-    quit_ = false;
+    {
+      // Probably can't be accessed from another thread with
+      // _captureThread empty, but the analyzer doesn't know this
+      MutexLock lock(&capture_lock_);
+      quit_ = false;
+    }
     _captureThread = rtc::PlatformThread::SpawnJoinable(
         [self = scoped_refptr(this)] {
           while (self->CaptureProcess()) {