btrfs: fix memory ordering between normal and ordered work functions

btrfs: fix memory ordering between normal and ordered work functions

This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven.
This ID is fixed in Linux Kernel version v4.4.293 by commit bd660a20fea3ec60a49709ef5360f145ec0fe779, it was introduced in version v3.15 by commit 08a9ff3264181986d1d692a4e6fce3669700c9f8. For more details please see the references link.