From 7b86854e4014b10844848f9619c648e6ccfbf9c6 Mon Sep 17 00:00:00 2001
From: Hirokazu Honda <hiroh@chromium.org>
Date: Wed, 1 Dec 2021 16:53:39 +0900
Subject: v4l2: Consolidate mutex classes to Mutex and MutexLocker

std::mutex and std::unique_lock are used in v4l2 directory,
mixing Mutex and MutexLocker. This consolidates them to Mutex
and MutexLocker.

This also fixes vidioc_dqbuf argument to take Mutex instead of
MutexLocker.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 src/v4l2/v4l2_camera.h         | 4 ++--
 src/v4l2/v4l2_camera_proxy.cpp | 8 ++++----
 src/v4l2/v4l2_camera_proxy.h   | 4 +++-
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/v4l2/v4l2_camera.h b/src/v4l2/v4l2_camera.h
index 4afbb331..bf1b6de4 100644
--- a/src/v4l2/v4l2_camera.h
+++ b/src/v4l2/v4l2_camera.h
@@ -8,10 +8,10 @@
 #pragma once
 
 #include <deque>
-#include <mutex>
 #include <utility>
 
 #include <libcamera/base/semaphore.h>
+#include <libcamera/base/thread.h>
 
 #include <libcamera/camera.h>
 #include <libcamera/file_descriptor.h>
@@ -71,7 +71,7 @@ private:
 
 	bool isRunning_;
 
-	std::mutex bufferLock_;
+	libcamera::Mutex bufferLock_;
 	libcamera::FrameBufferAllocator *bufferAllocator_;
 
 	std::vector<std::unique_ptr<libcamera::Request>> requestPool_;
diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index 3610e63c..79bc880d 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -575,7 +575,7 @@ int V4L2CameraProxy::vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg)
 }
 
 int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
-				  MutexLocker *locker)
+				  Mutex *lock)
 {
 	LOG(V4L2Compat, Debug) << "Servicing vidioc_dqbuf fd = " << file->efd();
 
@@ -593,9 +593,9 @@ int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
 		return -EINVAL;
 
 	if (!file->nonBlocking()) {
-		locker->unlock();
+		lock->unlock();
 		vcam_->waitForBufferAvailable();
-		locker->lock();
+		lock->lock();
 	} else if (!vcam_->isBufferAvailable())
 		return -EAGAIN;
 
@@ -753,7 +753,7 @@ int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *ar
 		ret = vidioc_qbuf(file, static_cast<struct v4l2_buffer *>(arg));
 		break;
 	case VIDIOC_DQBUF:
-		ret = vidioc_dqbuf(file, static_cast<struct v4l2_buffer *>(arg), &locker);
+		ret = vidioc_dqbuf(file, static_cast<struct v4l2_buffer *>(arg), &proxyMutex_);
 		break;
 	case VIDIOC_STREAMON:
 		ret = vidioc_streamon(file, static_cast<int *>(arg));
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index fccec241..040954dd 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -14,6 +14,8 @@
 #include <sys/types.h>
 #include <vector>
 
+#include <libcamera/base/thread.h>
+
 #include <libcamera/camera.h>
 
 #include "v4l2_camera.h"
@@ -57,7 +59,7 @@ private:
 	int vidioc_querybuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
 	int vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
 	int vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
-			 libcamera::MutexLocker *locker);
+			 libcamera::Mutex *lock);
 	int vidioc_streamon(V4L2CameraFile *file, int *arg);
 	int vidioc_streamoff(V4L2CameraFile *file, int *arg);
 
-- 
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