From aeace3c33cc49227dc51892c0afa7023555f6ddf Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 17 Jan 2016 08:34:35 +0000
Subject: [PATCH] Assert that the linkage between struct cdev_privdata and and
 struct file is consistent.

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
---
 sys/fs/devfs/devfs_vnops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
index a8f31113ace3..b147655da766 100644
--- a/sys/fs/devfs/devfs_vnops.c
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -185,6 +185,8 @@ devfs_destroy_cdevpriv(struct cdev_privdata *p)
 {
 
 	mtx_assert(&cdevpriv_mtx, MA_OWNED);
+	KASSERT(p->cdpd_fp->f_cdevpriv == p,
+	    ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p));
 	p->cdpd_fp->f_cdevpriv = NULL;
 	LIST_REMOVE(p, cdpd_list);
 	mtx_unlock(&cdevpriv_mtx);