Comment # 4 on bug 108139 from Duncan Roe

commit 691f2d763d0731224439686ecf2d440df8fe910e is on branch linux-4.18.y of
git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git. It was merged into
branch master as part of commit 54dbe75bbf1e189982516de179147208e90b5e45