From 170f31dedc2d526ed006dfb91d57ff0e67ac438f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Barnab=C3=A1s=20P=C5=91cze?= <pobrn@protonmail.com>
Date: Thu, 14 Oct 2021 21:05:53 +0200
Subject: [PATCH] pipewire-v4l2: increase reference count atomically

The reference count increment in `add_fd_map()` (called from `v4l2_dup()`)
may run at the same time as `unref_file()` (called from `v4l2_close()`).
Atomically increase the refcnt to avoid any problems.
---
 pipewire-v4l2/src/pipewire-v4l2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pipewire-v4l2/src/pipewire-v4l2.c b/pipewire-v4l2/src/pipewire-v4l2.c
index 42d31028b..83f336931 100644
--- a/pipewire-v4l2/src/pipewire-v4l2.c
+++ b/pipewire-v4l2/src/pipewire-v4l2.c
@@ -294,7 +294,7 @@ static int add_fd_map(int fd, struct file *file)
 	if (map != NULL) {
 		map->fd = fd;
 		map->file = file;
-		file->ref++;
+		ATOMIC_INC(file->ref);
 	}
 	pthread_mutex_unlock(&globals.lock);
 	return 0;