From ab7b0ae578c4ced40414f23fa55badeea27a350d Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Thu, 1 May 2003 03:51:05 +0000
Subject: [PATCH] Lock an update to a vm_object's ref_count.

---
 sys/kern/vfs_default.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 7e3f295cc37..cef1a0f8460 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -605,7 +605,9 @@ retry:
 		 * Dereference the reference we just created.  This assumes
 		 * that the object is associated with the vp.
 		 */
+		VM_OBJECT_LOCK(object);
 		object->ref_count--;
+		VM_OBJECT_UNLOCK(object);
 		vrele(vp);
 	} else {
 		if (object->flags & OBJ_DEAD) {