From 4c140a9cf43ee8a70b5bf407507d9f7be6bdcb29 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Jan 2010 12:56:08 -0500
Subject: [PATCH] --- yaml --- r: 179407 b: refs/heads/master c:
 8ad08d8a0c3823e9b06ef84c362c9361be323d2d h: refs/heads/master i:   179405:
 644b42cc021a8e725f67badc4b63420a7057ebe5   179403:
 d64970cb765ec0d18b47596ee690a032bf77c95d   179399:
 2aa6c1aac676dd670ee1c4e8a30c28eea1ff977d   179391:
 43a1d6f0d1b61c13a5ee2e9d3d4fec3d20d6d4de v: v3

---
 [refs]               | 2 +-
 trunk/fs/namespace.c | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index b2aea5ecab41..4be9be0fd122 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9b6e31021122babe3b3a67b102479f740928b5eb
+refs/heads/master: 8ad08d8a0c3823e9b06ef84c362c9361be323d2d
diff --git a/trunk/fs/namespace.c b/trunk/fs/namespace.c
index 7d70d63ceb29..461090a57b33 100644
--- a/trunk/fs/namespace.c
+++ b/trunk/fs/namespace.c
@@ -965,10 +965,12 @@ EXPORT_SYMBOL(may_umount_tree);
 int may_umount(struct vfsmount *mnt)
 {
 	int ret = 1;
+	down_read(&namespace_sem);
 	spin_lock(&vfsmount_lock);
 	if (propagate_mount_busy(mnt, 2))
 		ret = 0;
 	spin_unlock(&vfsmount_lock);
+	up_read(&namespace_sem);
 	return ret;
 }