From e1703ef5ae92c28aa50f22f2178493e7eb60150d Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Fri, 1 Dec 2017 22:51:02 +0000
Subject: [PATCH] Plug a name cache lock leak.

Reviewed by:	mjg
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
---
 sys/kern/vfs_cache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index c963f8227f60..0ed71900709a 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -1162,6 +1162,8 @@ retry_dotdot:
 			SDT_PROBE3(vfs, namecache, lookup, miss, dvp,
 			    "..", NULL);
 			mtx_unlock(dvlp);
+			if (dvlp2 != NULL)
+				mtx_unlock(dvlp2);
 			return (0);
 		}
 		if ((ncp->nc_flag & NCF_ISDOTDOT) != 0) {