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-rw-r--r--fs/namespace.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 2dd333b0fe7..6645846f205 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2246,10 +2246,14 @@ void __init mnt_init(void)
init_mount_tree();
}
-void __put_mnt_ns(struct mnt_namespace *ns)
+void put_mnt_ns(struct mnt_namespace *ns)
{
- struct vfsmount *root = ns->root;
+ struct vfsmount *root;
LIST_HEAD(umount_list);
+
+ if (!atomic_dec_and_lock(&ns->count, &vfsmount_lock))
+ return;
+ root = ns->root;
ns->root = NULL;
spin_unlock(&vfsmount_lock);
down_write(&namespace_sem);